BDMO 2020 regional questions for junior & secondary
1. 231 āĻā§ \[ \frac{1}{3} \] āĻĻāĻŋāϝāĻŧā§ āĻāĻžāĻ āĻāϰ⧠āĻĒā§āϰāĻžāĻĒā§āϤ āϏāĻāĻā§āϝāĻžāĻā§ āĻāĻŦāĻžāϰ 3 āĻĻāĻŋāϝāĻŧā§ āĻā§āĻŖ āĻāϰāϞ⧠āĻāϤ āĻĒāĻžāĻāϝāĻŧāĻž āϝāĻžāĻŦā§?
What will you get when 231 is divided by \[ \frac{1}{3} \] and the resultant again multiplied by 3?
2. S = 2020 + 2019 + 2018 + 2017 + ……… + 2 – 1āĨ¤ S āĻā§ 5 āĻĻā§āĻŦāĻžāϰāĻž āĻāĻžāĻ āĻāϰāϞ⧠āĻāĻžāĻāĻļā§āώ āĻāϤ āĻšāĻŦā§?
S=2020-2019+2018-2017+…………………+2-1 . What is the remainder when S is divided by 5?
3. 2310 āĻāϰ āϏāĻžāĻĨā§ 5 āϝā§āĻ āĻāϰ⧠āĻĒā§āϰāĻžāĻĒā§āϤ āϝā§āĻāĻĢāϞāĻā§ \[\frac{1}{5} \] āĻĻāĻŋāϝāĻŧā§ āĻāĻžāĻ āĻāϰ⧠āĻĒā§āϰāĻžāĻĒā§āϤ āϏāĻāĻā§āϝāĻžāĻā§ āĻāĻŦāĻžāϰ 5 āĻĻāĻŋāϝāĻŧā§ āĻā§āĻŖ āĻāϰāϞ⧠āĻāϤ āĻĒāĻžāĻāϝāĻŧāĻž āϝāĻžāĻŦā§?
Add 5 to 2310. Divide the result by 1/5 and then multiply by 5. Now, what is your final result
4. āĻāĻāĻāĻŋ āϏāĻŋāύā§āĻŽāĻž āĻšāϞ⧠āĻĒā§āϰāĻĨāĻŽ āϏāĻžāϰāĻŋāϤ⧠11 āĻāĻŋ āĻāϏāύ āĻāĻā§āĨ¤ āĻĒāϰā§āϝāĻžāϝāĻŧāĻā§āϰāĻŽā§ āĻĒā§āϰāϤāĻŋāĻāĻŋ āϏāĻžāϰāĻŋāϤ⧠āϤāĻžāϰ āϏāĻžāĻŽāύā§āϰ āϏāĻžāϰāĻŋāϰ āĻā§āϝāĻŧā§ āĻāĻāĻāĻŋ āĻāϏāύ āĻŦā§āĻļāĻŋ āĻāĻā§āĨ¤ āϝāĻĻāĻŋ āĻŽā§āĻ āϏāĻžāϰāĻŋ āϏāĻāĻā§āϝāĻž 30 āĻāĻŋ āĻšāϝāĻŧ āϤāĻžāĻšāϞ⧠āϏāĻŋāύā§āĻŽāĻž āĻšāϞ⧠āĻŽā§āĻ āĻāϤāĻāĻŋ āĻāϏāύ āĻāĻā§?
The first row of a movie theater has 11 seats. Each successive row has one more seat than the previous row. What is the number of seats in the theater if there are 30 rows?
5. 2020 āĻāϰ āĻā§āϝāĻŧā§ āĻā§āĻ āĻāϤāĻā§āϞ⧠āϧāύāĻžāϤā§āĻŽāĻ āϏāĻāĻā§āϝāĻž āϰāϝāĻŧā§āĻā§ āϝāĻžāĻĻā§āϰāĻā§ āϤāĻŋāύāĻāĻŋ āĻā§āϰāĻŽāĻŋāĻ āϧāύāĻžāϤā§āĻŽāĻ āϏāĻāĻā§āϝāĻžāϰ āϝā§āĻāĻĢāϞ āĻšāĻŋāϏā§āĻŦā§ āϞā§āĻāĻž āϝāĻžāϝāĻŧ āύāĻž?
Find the number of positive numbers less than 2020, which can not be written as the sum of three consecutive positive numbers.
6. āϰā§āĻŦāĻžāĻŦ āĻāĻāĻāĻŋ āϧāύāĻžāϤā§āĻŽāĻ āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻž āĻāĻŋāύā§āϤāĻž āĻāϰāϞ⧠āϝāĻž āĻāĻŋāύāĻž āĻāĻāĻāĻŋ āĻāύ āϏāĻāĻā§āϝāĻžāĨ¤ āϤāĻžāĻšāύāĻŋāĻ āĻāϰāĻ āĻāĻāĻāĻŋ āϧāύāĻžāϤā§āĻŽāĻ āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻž āĻāĻŋāύā§āϤāĻž āĻāϰāϞ⧠āϝāĻž āĻāĻŋāύāĻž āĻŦāϰā§āĻāϏāĻāĻā§āϝāĻžāĨ¤ āϤāĻžāĻĻā§āϰ āĻĻā§āĻāĻāύā§āϰ āϏāĻāĻā§āϝāĻžāϰ āϝā§āĻāĻĢāϞ ā§Ēā§Ļ āĻšāϞ⧠āϏāĻāĻā§āϝāĻžāĻĻā§āĻāĻŋāϰ āĻā§āĻŖāĻĢāϞ āĻāϤ?
Rubab thinks of a positive number that is a perfect cube, and Thanic thinks of a number that is a perfect square. If the sum of their numbers is 80, what is the product of their numbers?
7. āϤā§āĻŽāĻžāϰ āĻĻāĻļāĻāĻŋ āĻĒā§āĻāĻļāĻž āĻāĻŦā§āϤāϰ āĻāĻŋāϞāĨ¤ āϤā§āĻŽāĻŋ āϤā§āĻŽāĻžāϰ āĻāϝāĻŧā§āĻāĻāύ āĻŦāύā§āϧā§āĻā§ āϏā§āĻā§āϞ⧠āĻāĻžāĻ āĻāϰ⧠āĻĻāĻŋāϤ⧠āĻāĻžāĻāĨ¤ āĻĒā§āϰāĻĨāĻŽ āĻŦāύā§āϧ⧠āĻāϝāĻŧāĻŽāĻžāϏ⧠āĻāϝāĻŧā§āĻāĻāĻŋ āĻāĻŦā§āϤāϰ āύāĻŋāϞāĨ¤ āĻāϰāĻĒāϰ āϝāϤāĻā§āϞ⧠āĻāĻŦā§āϤāϰ āĻŦāĻžāĻā§ āĻāĻā§, āϏā§āĻā§āϞ⧠āĻŦāĻžāĻā§ āĻŦāύā§āϧā§āĻĻā§āϰ āĻĒā§āϰāϤā§āϝā§āĻāĻā§ 3 āĻāĻŋ āĻāϰ⧠āĻĻāĻŋāϞ 5 āĻāĻŋ āĻ āĻŦāĻļāĻŋāώā§āĻ āĻĨāĻžāĻā§ āĻāĻŦāĻ 5 āĻāĻŋ āĻāϰ⧠āĻĻāĻŋāϞā§āĻ 1 āĻāĻŋ āĻ āĻŦāĻļāĻŋāώā§āĻ āĻĨāĻžāĻā§āĨ¤ āĻĒā§āϰāĻĨāĻŽ āĻŦāύā§āϧ⧠āĻāϤāĻāĻŋ āĻāĻŦā§āϤāϰ āύāĻŋāϝāĻŧā§āĻāĻŋāϞ?
You have ten pigeons. You want to give these pigeons away to some of your friends. The first friend picks a number of pigeons of her choice for herself. After that you give away the remaining pigeons to the rest of your friends. If you give each of them 3 pigeons, 5 are left and if you give each of them 5 pigeons, 3 are left. How many pigeons did your first friend choose for herself?
8. āϝāĻĻāĻŋ \[ -8 \leq x \leq 2 \] āĻāĻŦāĻ \[-4 \leq y \leq 10 \] āĻšāϝāĻŧ, āϤāĻžāĻšāϞ⧠xy āĻāϰ āϏāϰā§āĻŦā§āĻā§āĻ āĻāĻŦāĻ āϏāϰā§āĻŦāύāĻŋāĻŽā§āύ āĻŽāĻžāύā§āϰ āĻŦāĻŋāϝāĻŧā§āĻāĻĢāϞā§āϰ āĻĒāϰāĻŋāĻŽāĻžāĻŖ āĻāϤ?
If -8â¤xâ¤2 and -4â¤yâ¤10, find the absolute difference of maximum and minimum value of xy.
9. āĻāĻāĻāĻž āĻā§āĻĄāĻŧāĻŋāϤ⧠100 āĻāϰ āĻā§āϝāĻŧā§ āĻāĻŽ āϏāĻāĻā§āϝāĻ āĻāĻĒā§āϞ āĻāĻā§āĨ¤ āĻāĻĒā§āϞāĻā§āϞ⧠2, 3, 5 āĻāύā§āϰ āĻŽāϧā§āϝ⧠āύāĻŋāĻāĻļā§āώ⧠āĻāĻžāĻ āĻāϰ⧠āĻĻā§āϝāĻŧāĻž āĻā§āϞā§āĻ 4 āĻāύā§āϰ āĻŽāϧā§āϝ⧠āĻāĻžāĻ āĻāϰ⧠āĻĻā§āϝāĻŧāĻž āϝāĻžāϝāĻŧ āύāĻžāĨ¤ āϏāϰā§āĻŦā§āĻā§āĻ āĻāϤāĻāĻŋ āĻāĻĒā§āϞ āĻĨāĻžāĻāĻž āϏāĻŽā§āĻāĻŦ āĻā§āĻĄāĻŧāĻŋāϤā§?
There are less than 100 apples in a basket. It is possible to divide the apples equally among 2, 3, and 5 children but not among 4 children. How many apples can there be in the basket at most?
10. āĻĒāĻžāĻāĻāĻāĻŋ āϏāĻāĻā§āϝāĻžāϰ āĻāĻĄāĻŧ 7āĨ¤ āĻāĻĻā§āϰ āĻŽāϧā§āϝ⧠āĻā§āύ āϏāĻāĻā§āϝāĻžāĻāĻŋāĻā§ 3 āĻĻāĻŋāϝāĻŧā§ āĻā§āĻŖ āĻāϰāĻž āĻšāϞ⧠āϏāĻāĻā§āϝāĻžāĻā§āϞā§āϰ āĻāĻĄāĻŧ 11 āĻšāĻŦā§?
The average of five numbers is 7. If one of the numbers is multiplied by 3, the average of the numbers increases to 11. Which of the five numbers is multiplied by 3?
11. \[ 2^p + 5^p = N \] āϝāĻĻāĻŋ p āĻŦāĻŋāĻā§āĻĄāĻŧ āĻŽā§āϞāĻŋāĻ āϏāĻāĻā§āϝāĻž āĻšāϝāĻŧ, āϤāĻŦā§ N āĻā§ 3 āĻĻā§āĻŦāĻžāϰāĻž āĻāĻžāĻ āĻāϰāϞ⧠āĻāĻžāĻāĻļā§āώ āĻāϤ āĻšāĻŦā§?[ \[ x^p\] āĻĻāĻŋāϝāĻŧā§ āĻŦā§āĻāĻžāϝāĻŧ x āĻā§ p āĻŦāĻžāϰ āĻā§āĻŖ āĻāϰ⧠āĻā§āĻŖāĻĢāϞ]
\[ 2^p + 5^p = N \] , if p is an odd prime number, what will be the remainder when dividing N by 3? [\[ x^p \] is x multiplied p times]
12. P, Q āĻĻā§āĻāĻāĻŋ āĻŦāĻŋāύā§āĻĻā§āϰ āĻĻā§āϰāϤā§āĻŦ 10, Q āĻāĻŦāĻ R āĻāĻ āĻĻā§āĻāĻāĻŋ āĻŦāĻŋāύā§āĻĻā§āϰ āĻĻā§āϰāϤā§āĻŦ 4 āĻāĻŦāĻ R, S āĻŦāĻŋāύā§āĻĻā§ āĻĻā§āĻāĻāĻŋāϰ āĻĻā§āϰāϤā§āĻŦ 3āĨ¤ P āĻāĻŦāĻ S āĻŦāĻŋāύā§āĻĻā§ āĻĻā§āĻāĻāĻŋāϰ āĻĻā§āϰāϤā§āĻŦā§āϰ āύā§āϝā§āύāϤāĻŽ āĻāϤ āĻšāĻŦā§?
Points P and Q are 10 units apart. Points Q and R are 4 units apart. Points R and S are 3 units apart. If P and S are as close as possible, find the distance between P and S.
13. āϝ⧠āϧāύāĻžāϤā§āĻŽāĻ āϏāĻāĻā§āϝāĻžāĻā§āϞ⧠āĻļā§āϧā§āĻŽāĻžāϤā§āϰ 1, 4, 6 āĻĻā§āĻŦāĻžāϰāĻž āĻāĻ āĻŋāϤ āĻšāϝāĻŧ āϏā§āĻ āϏāĻāĻā§āϝāĻžāĻā§āϞ⧠āϤā§āϰā§āϝā§āϝā§āϰ āĻĒāĻāύā§āĻĻā§āϰ āϏāĻāĻā§āϝāĻžāĨ¤ āϝā§āĻŽāύ: 1, 14, 146āĨ¤ āϤā§āϰā§āϝ āϤāĻžāϰ āĻĒāĻāύā§āĻĻā§āϰ āϏāĻāĻā§āϝāĻžāĻā§āϞ⧠āĻā§āĻ āĻĨā§āĻā§ āĻŦāĻĄāĻŧ āĻšāĻŋāϏā§āĻŦā§ āϏāĻžāĻāĻŋāϝāĻŧā§ āĻĒā§āϰāĻĨāĻŽ 120 āĻāĻŋ āϏāĻāĻā§āϝāĻž āϝā§āĻ āĻāϰāϞā§āĨ¤ āϝā§āĻāĻĢāϞāĻā§ 3 āĻĻāĻŋāϝāĻŧā§ āĻāĻžāĻ āĻāϰāϞ⧠āĻāĻžāĻāĻļā§āώ āĻāϤ āĻĨāĻžāĻāĻŦā§?
The positive integers that contain only 1,4,6 are Turzo’s favourite numbers. For example: 1, 14, 146. Turzo sorts his favourite numbers in asscending order and then sums the first 120 numbers. What will be the remainder if he divides the sum by 3?
14. āĻāĻāĻāĻŋ āĻŦāĻžāĻā§āϏ⧠7 āĻāĻŋ āύā§āϞ āĻŦāϞ, 9āĻāĻŋ āϞāĻžāϞ āĻŦāϞ āĻāĻŦāĻ 10āĻāĻŋ āϏāĻžāĻĻāĻž āĻŦāϞ āϰāϝāĻŧā§āĻā§āĨ¤ āĻĻā§āĻŦāĻā§āύ⧠āĻŦāĻžāĻā§āϰ āĻĨā§āĻā§ āĻāĻāĻāĻŋ āĻāĻāĻāĻŋ āĻāϰ⧠āĻŦāϞ āĻāϤā§āϤā§āϞāύ āĻāϰāĻž āĻšāϞā§āĻž āϝāϤāĻā§āώāĻŖ āύāĻž āĻāĻāĻ āϰāĻā§āϰ āĻāĻžāϰāĻāĻŋ āĻŦāϞ āĻ āĻĨāĻŦāĻž āύā§āϝā§āύāϤāĻŽ āĻĒā§āϰāϤā§āϝā§āĻ āϰāĻā§āϰ āĻĻā§āĻāĻāĻŋ āĻŦāϞ āĻāϤā§āϤā§āϞāύ āĻāϰāĻž āĻšāϝāĻŧāĨ¤ āĻāĻāĻžāĻŦā§ āϏāϰā§āĻŦā§āĻā§āĻ āĻāϤāĻāĻŋ āĻŦāϞ āĻāϤā§āϤā§āϞāύ āĻāϰāĻž āϝāĻžāĻŦā§?
A jar contains 7 blue balls, 9 red balls and 10 white balls. Balls are drawn at random one by one from the jar until either four balls of the same colour or at least two of each colour have been drawn. What is the largest number of balls that one may have to draw?
15. āĻāĻāĻāĻŋ āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻž, n āĻāϰ āĻāύā§āϝ 5n+16 āĻāĻŦāĻ 8n+29 āĻāϰ 1 āĻ āĻĒā§āĻā§āώāĻž āĻŦāĻĄāĻŧ āĻāĻāĻāĻŋ āϏāĻžāϧāĻžāϰāĻŖ āĻā§āĻĒāĻžāĻĻāĻ āϰāϝāĻŧā§āĻā§āĨ¤ āϏāĻžāϧāĻžāϰāĻŖ āĻā§āĻĒāĻžāĻĻāĻ āĻāϰ āĻŽāĻžāύ āĻāϤ?
For a certain integer n, 5n+16 and 8n+29 have a common factor larger than 1 . Find the common factor.
16. āĻāĻāĻāĻŋ āϧāύāĻžāϤā§āĻŽāĻ āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻžāϰ āϏāĻŽāĻžāύā§āϤāϰ āϧāĻžāϰāĻžāϰ āĻĒā§āϰāĻĨāĻŽ āĻĒāĻĻ 20 āĻāĻŦāĻ āĻļā§āώ āĻĒāĻĻ 4060āĨ¤ āĻāĻ āϰāĻāĻŽ āĻāϤāĻāĻŋ āĻāĻŋāύā§āύ āĻāĻŋāύā§āύ āϏāĻŽāĻžāύā§āϤāϰ āϧāĻžāϰāĻž āϏāĻŽā§āĻāĻŦ?
An arithmetic sequence of integers has 20 as the first term and 4060 as the last term. How many different sets of integers form such a sequence?
17. 4, 5, 6, 8, 14, 38, ………… āĻāĻ āϧāĻžāϰāĻžāϰ āĻĒāϰāĻŦāϰā§āϤ⧠āĻĒāĻĻ āĻā§?
4,5,6,8,14,38,……. what is the next number of this sequence?
18. āĻĒāĻžāĻļā§āϰ āĻāĻŋāϤā§āϰ⧠ABCD āĻāĻāĻāĻŋ āϏāĻžāĻŽāĻžāύā§āϤāϰāĻŋāĻāĨ¤ AB = 6, AC = 7, DE = 2āĨ¤ CF = a/b āĻāĻŦāĻ gcd(a, b) = 1 āĻšāϞā§, a+b = ?
ABCD is a parallelogram. If AB = 6, AC=7, DE=2. CF = a/b and gcd(a,b)=1. then, a+b =?
19. āĻā§āϝā§āϤāĻŋāϰ āĻāĻžāĻā§ āĻĒā§āϰāϝāĻŧā§āĻāύā§āϝāĻŧ āϏāĻāĻā§āϝāĻ 2 āĻāĻžāĻāĻžāϰ āĻāĻŦāĻ 5 āĻāĻžāĻāĻžāϰ āύā§āĻ āϰāϝāĻŧā§āĻā§āĨ¤ āĻā§āϝā§āϤāĻŋ āĻāĻāĻāĻŋ āϏā§āĻĒāĻžāϰ āĻļāĻĒā§ āĻāĻŋāϝāĻŧā§ 2020 āĻāĻžāĻāĻžāϰ āĻāĻ āĻā§āĻĄāĻŧāĻž āĻā§āϤāĻž āĻāĻŋāύāϞā§āĨ¤ āϏ⧠āĻāϤāĻāĻžāĻŦā§ āĻāĻ āĻā§āϤāĻžāϰ āĻĻāĻžāĻŽ āĻĻāĻŋāϤ⧠āĻĒāĻžāϰāĻŦā§?
Juty has required numbers of 2 taka and 5 taka notes. Juty bought a pair of shoes with 2020 taka with those notes from a supershop. In how many ways Juty can pay for the shoes with those notes?
20. \[ a \times a – b \times b = n \], āϝā§āĻāĻžāύ⧠n āĻāĻāĻāĻŋ āϧāύāĻžāϤā§āĻŽāĻ āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻž āϝāĻž 101 āĻāϰ āĻā§āϝāĻŧā§ āĻā§āĻāĨ¤ n-āĻāϰ āĻāϤāĻā§āϞ⧠āĻŽāĻžāύā§āϰ āĻāύā§āϝ a, b-āĻāϰ āĻŽāĻžāύ āĻā§āĻžāύ āϧāύāĻžāϤā§āĻŽāĻ āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻž āĻšāĻŦā§ āύāĻž?
a à a – b à b = n, where n is a positive integer less than 101. For how many values of n, both a and b will not be positive integers?
21. ABCD āĻāĻāĻāĻŋ āĻāϝāĻŧāϤāĻā§āώā§āϤā§āϰ āϝā§āĻāĻžāύ⧠AB = 8 āĻāĻŦāĻ AD = 6āĨ¤ DC āĻāĻĒāϰ E, F āĻŦāĻŋāύā§āĻĻā§ āĻāĻŽāύāĻāĻžāĻŦā§ āĻ āĻŦāϏā§āĻĨāĻŋāϤ āϝā§āύ DE = 3 āĻāĻŦāĻ CF = 2āĨ¤ AF āĻāĻŦāĻ BE āĻĒāϰāϏā§āĻĒāϰ H āĻŦāĻŋāύā§āĻĻā§āϤ⧠āĻā§āĻĻ āĻāϰā§āĨ¤ âAHB āĻāϰ āĻā§āώā§āϤā§āϰāĻĢāϞ = \[ \frac{x}{11} \], āϝā§āĻāĻžāύ⧠x āĻāĻāĻāĻŋ āϧāύāĻžāϤā§āĻŽāĻ āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻžāĨ¤ x āĻāϰ āĻŽāĻžāύ āĻāϤ?
ABCD is a rectangle where AB=8 and AD=6. Points E and F are on the line segment DC where DE=3 and CF=2. Lines AF and BE intersect at point H.The area of ÎAHB = x/11, where x is a positive integer. What is the value of x?
22. p = q + r – s, q = r + s – p, r = s + p – q ; āĻāĻŦāĻ \[ pqrs \neq 0 \] āĻšāϞ⧠\[ \frac{p}{r} + \frac{q}{s} + \frac{r}{p} + \frac{s}{q} \] āĻāϰ āĻŽāĻžāύ āĻāϤ āĻšāĻŦā§?
p=q+r-s;q=r+s-p;r=s+p-q; And pqrsâ 0 then what is the value of \[ \frac{p}{r} + \frac{q}{s} + \frac{r}{p} + \frac{s}{q} \]?
23. āϝāĻĻāĻŋ \[ x + \frac{1}{x} = 2\], āϤāĻžāĻšāϞ⧠\[ x^{2020} + \frac{1}{x^{2019}} (x^{2019} + \frac{1}{x^{2020}}) \] āĻāϰ āĻŽāĻžāύ āĻāϤ āĻšāĻŦā§?
If \[ x + \frac{1}{x} = 2\], then what is the value of \[ x^{2020} + \frac{1}{x^{2019}} (x^{2019} + \frac{1}{x^{2020}}) \]?
24. āĻāĻāĻāĻŋ āĻāϝāĻŧ āĻĒā§āώā§āĻ āĻŦāĻŋāĻļāĻŋāώā§āĻ āĻāĻā§āĻāĻžāϝāĻŧ 1 āĻĨā§āĻā§ 6 āĻāĻ āĻāϝāĻŧāĻāĻŋ āϏāĻāĻā§āϝāĻž āĻāĻŽāύāĻāĻžāĻŦā§ āϞā§āĻāĻž āĻāĻā§ āϝā§āύ āϝ⧠āĻā§āύ āĻāĻāĻāĻŋ āĻĒā§āώā§āĻ āĻāĻŦāĻ āϤāĻžāϰ āĻ
āĻĒāϰ āĻĒā§āώā§āĻ ā§āϰ āϏāĻāĻā§āϝāĻžāϰ āϝā§āĻāĻĢāϞ 7 āĻšāϝāĻŧāĨ¤ āĻĒāĻžāĻļā§āϰ āĻāĻŋāϤā§āϰ⧠āĻĻā§āĻāĻŋ āĻāĻāĻ āϰāĻāĻŽ āĻāĻā§āĻāĻž āĻĒāĻžāĻļāĻžāĻĒāĻžāĻļāĻŋ āϰāϝāĻŧā§āĻā§āĨ¤ āϝ⧠āĻĻā§āĻāĻŋ āĻĒā§āώā§āĻ āĻāĻā§ āĻ
āĻĒāϰā§āϰ āϏāĻžāĻĨā§ āϏā§āĻĒāϰā§āĻļā§ āϰāϝāĻŧā§āĻā§ āϤāĻžāĻĻā§āϰ āϝā§āĻāĻĢāϞ āĻāϤ?
In a standard six-sided die, numbers from 1 to 6 are placed in such order, that sum of any side and its opposite side is 7. Two identical standard six-sided dice are placed side by side as shown. What is the sum of the numbers of dots on the two faces that touch each other?
Secondary level
1. 2020 āĻāϰ āĻāϤāĻā§āϞ⧠āĻā§āĻĄāĻŧ āĻā§āĻĒāĻžāĻĻāĻ āĻāĻā§?
How many even divisors does 2020 have?
2. āĻāĻāĻāĻŋ āϤā§āϰāĻŋāĻā§āĻā§āϰ āϤāĻŋāύ āĻŦāĻžāĻšā§āϰ āĻĻā§āϰā§āĻā§āϝ āϝāĻĨāĻžāĻā§āϰāĻŽā§ 4, 6 āĻāĻŦāĻ 9āĨ¤ āĻ āĻĒāϰ āĻāĻāĻāĻŋ āϏāĻĻā§āĻļ āϤā§āϰāĻŋāĻā§āĻā§āϰ āĻāĻ āĻŦāĻžāĻšā§āϰ āĻĻā§āϰā§āĻā§āϝ 36āĨ¤ āĻĻā§āĻŦāĻŋāϤā§āϝāĻŧ āϤā§āϰāĻŋāĻā§āĻā§āϰ āϏāϰā§āĻŦā§āĻā§āĻ āĻĒāϰāĻŋāϏā§āĻŽāĻž āĻāϤ āĻšāϤ⧠āĻĒāĻžāϰā§?
The side lengths of a triangle are 4, 6 and 9. One of the side lengths of a triangle similar to the first triangle is 36. What is the maximum possible perimeter of the second triangle?
3. āĻāϤāĻā§āϞ⧠āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻž p āĻāϰ āĻāύā§āϝ p à p + 2 à p – 19 āĻāĻ āϰāĻžāĻļāĻŋāĻāĻŋāϰ āĻāĻāĻāĻŋ āĻāύāĻžāϤā§āĻŽāĻ āĻŽāĻžāύ āĻāϏāĻŦā§?
For how many integer values of p does the expression p à p + 2 à p – 19 have a negative valueâ?
4. āĻāĻāĻāĻŋ āϏāĻŽāĻā§āĻŖā§ āϤā§āϰāĻŋāĻā§āĻā§āϰ āϤāĻŋāύ āĻŦāĻžāĻšā§āϰ āĻĻā§āϰā§āĻā§āϝ āϝāĻĨāĻžāĻā§āϰāĻŽā§ x – 7, x, āĻāĻŦāĻ x + 2 āĻšāϞ⧠āϤā§āϰāĻŋāĻā§āĻāĻāĻŋāϰ āĻĒāϰāĻŋāϏā§āĻŽāĻž āĻāϤ āĻšāĻŦā§?
The lengths of the sides of a right triangle are x-7, x, x+2. Find the numeric value of the perimeter of the triangle.
5. āĻāϤāĻā§āϞ⧠3 āĻ āĻā§āĻ āĻŦāĻŋāĻļāĻŋāώā§āĻ āϏāĻāĻā§āϝāĻž āĻĒāĻžāĻāϝāĻŧāĻž āϝāĻžāĻŦā§ āϝā§āĻāĻžāύ⧠āĻ āĻā§āĻ āϤāĻŋāύāĻāĻŋ āĻāĻāĻāĻŋ āϧāύāĻžāϤā§āĻŽāĻ āϏāĻŽāĻžāύā§āϤāϰ āĻ āύā§āĻā§āϰāĻŽ āĻŽā§āύ⧠āĻāϞā§?
How many 3 digits number are there such that their digits are in arithmatic progression with positive difference?
6. n āĻāĻāĻāĻŋ āĻĒāĻžāĻāĻ āĻ āĻā§āĻ āĻŦāĻŋāĻļāĻŋāώā§āĻ āĻĒā§āϝāĻžāϞāĻŋāύāĻĄā§āϰā§āĻŽāĻŋāĻ āϏāĻāĻā§āϝāĻž āĻāĻŦāĻ 7n āĻāĻāĻāĻŋ āĻāϝāĻŧ āĻ āĻā§āĻāĻŦāĻŋāĻļāĻŋāώā§āĻ āĻĒā§āϝāĻžāϞāĻŋāύāĻĄā§āϰā§āĻŽāĻŋāĻ āϏāĻāĻā§āϝāĻž āĻšāϞ⧠n āĻāϰ āϏāϰā§āĻŦā§āĻā§āĻ āĻŽāĻžāύ āĻāϤ?
What is the greatest 5-digit palindrome n such that 7n is a 6-digit palindrome?
7. āĻāĻāĻāĻŋ āϏāĻŽāĻŦāĻžāĻšā§ āϤā§āϰāĻŋāĻā§āĻā§āϰ āĻĒā§āϰāϤā§āϝā§āĻ āĻŦāĻžāĻšā§āĻā§ āĻāĻŽāύ āĻāĻžāĻŦā§ āĻĻā§āĻ āĻāĻžāĻā§ āĻāĻžāĻ āĻāϰāĻž āĻšāϝāĻŧā§āĻā§ āϝā§āύ āĻ
āĻāĻļ āĻĻā§āĻāĻŋāϰ āĻŽāϧā§āϝ⧠āĻ
āύā§āĻĒāĻžāϤ 4:1 āĻšāϝāĻŧāĨ¤ āĻŦāĻŋāĻāĻā§āϤāĻāĻžāϰ⧠āĻŦāĻŋāύā§āĻĻā§ āϤāĻŋāύāĻāĻŋ āĻĻāĻŋāϝāĻŧā§ āĻāĻāĻāĻŋ āϏāĻŽāĻŦāĻžāĻšā§ āϤā§āϰāĻŋāĻā§āĻ āĻāĻ āĻŋāϤ āĻšāϝāĻŧāĨ¤ āϝāĻĻāĻŋ āĻā§āĻ āϤā§āϰāĻŋāĻā§āĻ āĻāĻŦāĻ āĻŦāĻžāĻšāĻŋāϰā§āϰ āĻŦāĻĄāĻŧ āϤā§āϰāĻŋāĻā§āĻā§āϰ āĻā§āώā§āϤā§āϰāĻĢāϞā§āϰ āĻ
āύā§āĻĒāĻžāϤ a/b āĻšāϝāĻŧ, āϝā§āĻāĻžāύ⧠a, b āĻĒāϰāϏā§āĻĒāϰ āϏāĻšāĻŽā§āϞāĻŋāĻ āϏāĻāĻā§āϝāĻž, āϤāĻžāĻšāϞ⧠a+b āĻāϰ āĻŽāĻžāύ āĻāϤ?
The sides of an equilateral triangle are divided into pieces that are in the ratio of 4:1 in such a way that the dividing points also form an equilateral triangle (see figure). Ratio of the area of the smaller equilateral triangle to the area of the larger equilateral triangle is equalt to a/b where a and b are coprime then find a+b
8. ABC āĻāĻāĻāĻŋ āϏāĻŽāĻā§āĻŖā§ āϤā§āϰāĻŋāĻā§āĻ āϝā§āĻāĻžāύ⧠AC=6 āĻāĻŦāĻ CB=4āĨ¤ āĻāĻāĻāĻŋ āĻ
āϰā§āϧāĻŦā§āϤā§āϤ āĻ
āĻā§āĻāύ āĻāϰāĻž āĻšāϞ⧠āϝāĻžāϰ āĻā§āύā§āĻĻā§āϰ āĻ
āϤāĻŋāĻā§āĻā§āϰ āĻāĻĒāϰ āĻ
āĻŦāϏā§āĻĨāĻŋāϤ āĻāĻŦāĻ āĻ
āϰā§āϧāĻŦā§āϤā§āϤāĻŋ āĻ
āĻĒāϰ āĻĻā§āĻ āĻŦāĻžāĻšā§āĻā§ āϏā§āĻĒāϰā§āĻļ āĻāϰā§āĨ¤ āϝāĻĻāĻŋ āĻ
āϰā§āϧāĻŦā§āϤā§āϤāĻāĻŋ āĻŦā§āϝāĻžāϏāĻžāϰā§āϧ a/b āĻšāϝāĻŧ āϝā§āĻāĻžāύ⧠a, b āĻĒāϰāϏā§āĻĒāϰ āϏāĻšāĻŽā§āϞāĻŋāĻ āϏāĻāĻā§āϝāĻž, āϤāĻžāĻšāϞ⧠a+b āĻāϰ āĻŽāĻžāύ āĻāϤ?
In a right angle triangle ABC , AC=6 and CB=4, we construct a halfcircle with center on the hypotenuse and being tangent to the rectangular sides. If the radius of the semi circle is a/b where a,b are co-prime ,determine a+b.
9. ABC āĻāĻāĻāĻŋ āϏāĻŽāĻā§āĻŖā§ āϤā§āϰāĻŋāĻā§āĻ āϝāĻžāϰ AB=30 āĻāĻŦāĻ BC=40āĨ¤ A āĻŦāĻŋāύā§āĻĻā§ āĻĨā§āĻā§ āĻŽāϧā§āϝāĻŽāĻž AD āĻāĻŦāĻ āĻā§āĻŖā§āϰ āϏāĻŽāĻĻā§āĻŦāĻŋāĻāύā§āĻĄāĻ AE āĻ
āĻā§āĻāύ āĻāϰāĻž āĻšāϞā§āĨ¤ AED āϤā§āϰāĻŋāĻā§āĻā§āϰ āĻā§āώā§āϤā§āϰāĻĢāϞ āĻāϤ?
ABC is a right angle triangle where AB=30 and BC=40. If we draw the median AD and the bisector AE from point A, we obtain a new triangle AED. Determine the area of that triangle.
10. 2, 3, …, 100 āĻāĻāĻžāĻŦā§ 99āĻāĻŋ āϏāĻāĻā§āϝāĻž āĻĻā§āĻāϝāĻŧāĻž āĻāĻā§āĨ¤ 5āĻāύ āĻŦāύā§āϧ⧠āĻŽāĻŋāϞ⧠āϤā§āĻŽāĻŋ āĻāĻ āϏāĻāĻā§āϝāĻžāĻā§āϞ⧠āύāĻŋāϝāĻŧā§ āĻā§āϞāĻā§āĨ¤ āĻĒā§āϰāĻĨāĻŽā§ āϤā§āĻŽāĻŋ 2āĻāϰ āϏāĻŦ āĻā§āĻŖāĻŋāϤāĻ āĻŦāĻžāĻĻ āĻĻāĻŋāϝāĻŧā§ āĻĻāĻžāĻ, āĻāϰāĻĒāϰā§āϰ āĻŦāύā§āϧ⧠āĻāϏ⧠āĻ āĻŦāĻļāĻŋāώā§āĻ āϏāĻāĻā§āϝāĻžāĻā§āϞā§āϰ āĻŽāϧā§āϝ⧠āϏāĻŦāĻā§āϝāĻŧā§ āĻā§āĻ āϏāĻāĻā§āϝāĻžāĻāĻŋāϰ āϏāĻāϞ āĻā§āĻŖāĻŋāϤāĻ āĻŦāĻžāĻĻ āĻĻāĻŋāϝāĻŧā§ āĻĻā§āϝāĻŧ, āϤāĻžāϰāĻĒāϰā§āϰ āĻŦāύā§āϧ⧠āĻ āĻŦāĻļāĻŋāώā§āĻ āϏāĻāĻā§āϝāĻžāĻā§āϞā§āϰ āĻŽāĻžāĻā§ āĻā§āώā§āĻĻā§āϰāϤāĻŽ āϏāĻāĻā§āϝāĻžāĻāĻŋāϰ āϏāĻāϞ āĻā§āĻŖāĻŋāϤāĻ āĻŦāĻžāĻĻ āĻĻāĻŋāϤ⧠āĻĨāĻžāĻā§ āĻāĻāĻžāĻŦā§ āĻā§āϞāĻžāĻāĻŋ āĻāϞāϤ⧠āĻĨāĻžāĻā§āĨ¤ āϤā§āĻŽāĻžāĻĻā§āϰ āĻŽāϧā§āϝ⧠āϝāĻžāϰ āĻāĻžāĻā§ āĻāϰ āĻŦāĻžāĻĻ āĻĻā§āĻāϝāĻŧāĻžāϰ āĻŽāϤ⧠āϏāĻāĻā§āϝāĻž āĻĨāĻžāĻāĻŦā§ āύāĻž āϏ⧠āĻā§āϞāĻžāĻāĻŋ āĻāĻŋāϤ⧠āϝāĻžāϝāĻŧāĨ¤ āĻāĻ āĻā§āϞāĻžāĻāĻŋāϤ⧠āĻāϤāϤāĻŽ āĻŦā§āϝāĻā§āϤāĻŋ āĻāĻŋāϤ⧠āϝāĻžāϝāĻŧ?
99 numbers are given in the order: 2,3,âĻ,100. 5 friends including you are playing with these numbers. At first you remove all the multiples of 2. The next friend comes and removes the multiples of next remaining smallest number. And this goes in repeated process. The person who doesn’t have anything to remove wins the game. What will be the serial of the winner?
11. āĻĒāĻžāĻļā§āϰ āĻāĻŋāϤā§āϰāĻāĻŋāϤ⧠P, AB āĻāϰ āĻāĻĒāϰ āĻāĻŽāύ āĻāĻāĻāĻŋ āĻŦāĻŋāύā§āĻĻā§ āϝā§āύ AP:PB = 5:4āĨ¤ PQ āĻāĻŦāĻ AC āĻĒāϰāϏā§āĻĒāϰ āϏāĻŽāĻžāύā§āϤāϰāĻžāϞ āĻāĻŦāĻ CP āĻāĻŦāĻ QD āĻĒāϰāϏā§āĻĒāϰ āϏāĻŽāĻžāύā§āϤāϰāĻžāϞāĨ¤ AR āĻāĻŦāĻ QS, CP āĻāϰ āĻāĻĒāϰ āϞāĻŽā§āĻŦ āĻāĻŦāĻ QS = 6āĨ¤ āϤāĻžāĻšāϞ⧠AP:PD = a/b āϝā§āĻāĻžāύ⧠a, b āĻĒāϰāϏā§āĻĒāϰ āϏāĻšāĻŽā§āϞāĻŋāĻ āϧāύāĻžāϤā§āĻŽāĻ āĻŽā§āϞāĻŋāĻ āϏāĻāĻā§āϝāĻž, āϤāĻžāĻšāϞ⧠a+b = ?
In the figure given below, P is a point on AB such that AP:PB=5:4 . PQ is parallel to AC and QD is parallel to CP. AR and QS are perpendicular to CP. Length of QS=6 then ratio of AP:PD=a/b where a,b are relatively coprime and positive number. Then a+b=?
12. ABC āĻāĻāĻāĻŋ āϏāĻŽāĻā§āĻŖā§ āϤā§āϰāĻŋāĻā§āĻāĨ¤ āϤā§āϰāĻŋāĻā§āĻāĻāĻŋāϰ āĻĒāϰāĻŋāĻā§āύā§āĻĻā§āϰ O, āϞāĻŽā§āĻŦāĻā§āύā§āĻĻā§āϰ H, F, AB āϰā§āĻāĻžāĻāĻļā§ āĻ
āĻŦāϏā§āĻĨāĻŋāϤ āĻāĻāĻāĻŋ āĻŦāĻŋāύā§āĻĻā§, AH āĻāϰ āĻŽāϧā§āϝāĻŦāĻŋāύā§āĻĻā§ M āĻāĻŦāĻ OF || BCāĨ¤
āĻā§āĻŖ FMC āĻāϰ āĻŽāĻžāύ āĻĄāĻŋāĻā§āϰāĻŋāϤ⧠āĻāϤ?
Let ABC be an acute triangle.Let OF || BC where O is the circumcenter and F is between A and B.Let H be the orthocenter.Let M be the midpoint of AH. What is the value of angle FMC in degrees?
13. āĻāĻŦāĻžāϰā§āϰ IMO āϤ⧠āϏāĻŋāĻĻā§āϧāĻžāύā§āϤ āύā§āĻāϝāĻŧāĻž āĻšāϞ āĻĒā§āϰāϤāĻŋ āĻāĻŋāĻŽā§ 10 āĻāύ āĻāϰ⧠āϏāĻĻāϏā§āϝ āĻĨāĻžāĻāĻŦā§āĨ¤ āĻāĻŋāĻŽā§āϰ āĻ āύā§āϤāϤ āĻĻā§āĻāĻāύā§āϰ āĻāĻāĻ āĻĻāĻŋāύ⧠āĻāύā§āĻŽāĻĻāĻŋāύ āĻšāĻŦāĻžāϰ āϏāĻŽā§āĻāĻžāĻŦāύāĻž āĻāϤ?
In this years IMO a deceision has been taken that each team will be consist of 10 members. What is the probability that at least two person will have birthday in same day of the week?
14. āĻāĻŽāύ āϏāĻāϞ (x, y, z); (x < y < z) āĻā§ā§āϰ āϏāĻŽāώā§āĻāĻŋ āĻŦā§āϰ āĻāϰ āϝā§āĻāĻžāύ⧠x, y, z, z-y, y-x, z-x āĻŽā§āϞāĻŋāĻ āĻšāϝāĻŧāĨ¤ (āϏāĻāϞ āĻā§ā§āϰ āϏāĻŽāώā§āĻāĻŋ āĻŦā§āϰ āĻāϰ⧠āϏā§āĻ āϏāĻŽāώā§āĻāĻŋāĻā§āϞā§āϰ āϏāĻŽāώā§āĻāĻŋ āύāĻŋāϰā§āĻŖāϝāĻŧ āĻāϰāϤ⧠āĻšāĻŦā§āĨ¤)
Find the sum of all triples (x, y, z ; (x<y<z) ) such that x, y, z, z-y, y-x, z-x are all prime positive integers. (First sum all the triples individually, then summ all the sums.)
15. 1, 2, 3, 4, 5, 6 āϏāĻāĻā§āϝāĻžāĻā§āϞā§āĻā§ āϞāĻžāϞ, āϏāĻŦā§āĻ āĻāϰ āύā§āϞ āϰāĻ āĻĻāĻŋāϝāĻŧā§ āĻāϤāĻāĻžāĻŦā§ āϰāĻ āĻāϰāĻž āϝāĻžāϝāĻŧ āϝā§āύ āĻā§āύ⧠āϏāĻāĻā§āϝāĻž āĻāϰ āϤāĻžāϰ āĻā§āύ⧠āĻĒā§āϰāĻā§āϤ āĻā§āĻĒāĻžāĻĻāĻā§āϰ āϰāĻ āĻāĻāĻ āύāĻž āĻšāϝāĻŧ? (āĻā§āύ⧠āϏāĻāĻā§āϝāĻžāϰ āĻĒā§āϰāĻā§āϤ āĻā§āĻĒāĻžāĻĻāĻāĻā§āϞ⧠āĻšāϞ⧠āϏ⧠āύāĻŋāĻā§ āĻŦāĻžāĻĻā§ āĻŦāĻžāĻāĻŋ āĻā§āĻĒāĻžāĻĻāĻāĻā§āϞā§)āĨ¤
How many ways are there to color the numbers 1, 2, 3, 4, 5, 6 with the colors red, green and blue such that no number is colored the same as one of its proper divisors? (The proper divisors of a number are the divisors that are not equal to the number itself)
16. aâ + aâ + aâ + … āĻāĻāĻāĻž āĻ āϏā§āĻŽ āĻā§āĻŖā§āϤā§āϤāϰ āϧāĻžāϰāĻž āϝāĻžāϰ āϏāĻŽāώā§āĻāĻŋ 3āĨ¤ āϧāĻžāϰāĻžāĻāĻŋāϰ āĻĒā§āϰāϤāĻŋāĻāĻž āĻĒāĻĻāĻā§ āϤāĻžāϰ āĻŦāϰā§āĻ āĻĻāĻŋāϝāĻŧā§ āĻŦāĻĻāϞ⧠āĻĻāĻŋāϞ⧠āϤāĻžāϰ āϏāĻŽāώā§āĻāĻŋ āĻ āĻĒāϰāĻŋāĻŦāϰā§āϤāĻŋāϤ āĻĨāĻžāĻā§āĨ¤ āϧāĻžāϰāĻžāĻāĻŋāϰ āĻĒā§āϰāϤāĻŋāĻāĻž āĻĒāĻĻāĻā§ āϤāĻžāϰ āĻāύ āĻĻāĻŋāϝāĻŧā§ āĻŦāĻĻāϞ⧠āĻĻāĻŋāϞ⧠āĻĒāϰāĻŋāĻŦāϰā§āϤāĻŋāϤ āϧāĻžāϰāĻžāĻāĻŋāϰ āϏāĻŽāώā§āĻāĻŋāĻā§ a/b āĻāĻāĻžāϰ⧠āĻĒā§āϰāĻāĻžāĻļ āĻāϰāĻž āϝāĻžāϝāĻŧ āϝā§āĻāĻžāύ⧠a āĻāĻŦāĻ b āĻĒāϰāϏā§āĻĒāϰ āϏāĻšāĻŽā§āϞāĻŋāĻ āϧāύāĻžāϤā§āĻŽāĻ āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻžāĨ¤ āϤāĻžāĻšāϞ⧠(a+b) āĻāϤ?
aâ + aâ + aâ + …is an infinite geometric series whose sum is 3. Replacing each of the terms of the series by their squares results in a series whose sum is the same. Replacing each of the terms of the series by their cubes results in a series whose sum can be expressed by a/b where a and b are co-pime positive integers. What is a+b?
17. āĻāϤāĻā§āϞ⧠āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻžāϰ āĻā§āĻĄāĻŧāĻž (a, b) āĻāĻā§ āϝā§āĻāĻžāύ⧠100 ⤠a, b ⤠200 āĻāĻŦāĻ a+b āĻāϰ āĻāϰāĻžāϰ āϏāĻŽāϰā§āĻĨāύ āϏāĻŽā§āϝāĻ āĻšāϤ⧠āĻāĻŋāĻā§ āϰāĻžāĻā§ āϞāĻžāĻā§ āύāĻž?
How many ordered pairs of integers (a, b) are there such that 100 ⤠a, b ⤠200 and no carrying is required when calculating a+b?
18. āĻļā§āϧ⧠1, 2, 3, āĻ āĻā§āώāϰāĻā§āϞ⧠āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻāϰ⧠āĻāĻ āĻŋāϤ āϏāĻāĻā§āϝāĻžāĻā§āϞā§āĻā§ āĻāĻĻā§āĻāĻžāĻŦāύā§āϰ āϞā§āĻāĻžāϰ āĻšāϞā§: 1, 2, 3, 11, 12, 13, …āĨ¤ 2020-āϤāĻŽ āϏāĻāĻā§āϝāĻžāĻāĻŋ āĻā§ āĻšāĻŦā§?
The numbers obtained by only using the digits 1, 2 and 3 are written in ascending order: 1, 2, 3, 11, 12, 13, … . What is the 2020-th number in this sequence?