BD math Olympiad 2019 national questions
Primary Category
1. āĻĢāĻžāϰāĻšāĻžāύ āϤāĻžāϰ āĻĒāϰā§āĻā§āώāĻžāϰ āύāĻŽā§āĻŦāϰ āĻŽā§ā§āĻžāĻ, āĻŦā§āώā§āĻāĻŋ, āĻāĻŦāĻ āĻŽā§āϰāϏāĻžāϞāĻŋāύāĻā§ āĻĻā§āĻāĻžāϞā§, āĻāĻŋāύā§āϤ⧠āĻ āύā§āϝ āϏāĻŦāĻžāĻ āϤāĻžāĻĻā§āϰ āύāĻŋāĻā§āϰ āύāĻŽā§āĻŦāϰ āϞā§āĻāĻŋā§ā§ āϰāĻžāĻāϞāĨ¤ āĻŽā§ā§āĻžāĻ āĻŽāύ⧠āĻāϰāϞā§, “āĻāĻŽāĻĒāĻā§āώ⧠āĻāĻŽāĻžāĻĻā§āϰ āĻŽāϧā§āϝ⧠āĻĻā§āĻāĻāύā§āϰ āύāĻŽā§āĻŦāϰ āϏāĻŽāĻžāύāĨ¤” āĻŦā§āώā§āĻāĻŋ āĻŽāύ⧠āĻāϰāϞā§, “āĻāĻŽāĻŋ āϏāĻŦāĻā§ā§ā§ āĻāĻŽ āύāĻŽā§āĻŦāϰ āĻĒāĻžāĻāύāĻŋāĨ¤” āĻŽā§āϰāϏāĻžāϞāĻŋāύ āĻŽāύ⧠āĻāϰāϞā§, “āĻāĻŽāĻŋ āϏāĻŦāĻā§ā§ā§ āĻŦā§āĻļāĻŋ āύāĻŽā§āĻŦāϰ āĻĒāĻžāĻāύāĻŋāĨ¤”
āĻ. āĻā§ āϏāĻŦāĻā§ā§ā§ āĻŦā§āĻļāĻŋ āύāĻŽā§āĻŦāϰ āĻĒā§ā§ā§āĻā§?
āĻ. āĻā§ āϏāĻŦāĻā§ā§ā§ āĻāĻŽ āύāĻŽā§āĻŦāϰ āĻĒā§ā§ā§āĻā§?
Farhan shows his test score to Muaz, Bristy and Mursalin, but everyone else keeps it hidden. Muaz thinks, âAt least two of us get same scoresâ Bristy thinks, âI didnât get the lowest score.â Mursalin thinks, âI didnât get the highest score.â
a. Who got the highest marks? (6 marks)
b. Who got the lowest marks?
2. O āĻšāϞ⧠āĻāĻāĻāĻŋ āĻŦā§āϤā§āϤā§āϰ āĻā§āύā§āĻĻā§āϰāĨ¤ āĻāĻāĻāĻŋ āϏāϰāϞāϰā§āĻāĻž āĻĻā§āĻāĻāĻŋ āĻĒāϰāϏā§āĻĒāϰ āϏāĻŽāĻžāύā§āϤāϰāĻžāϞ āϰā§āĻāĻžāĻā§ X āĻ Y āĻŦāĻŋāύā§āĻĻā§āϤ⧠āĻā§āĻĻ āĻāϰ⧠āĻāĻŦāĻ O āĻŦāĻŋāύā§āĻĻā§āϰ āĻŽāϧā§āϝ āĻĻāĻŋā§ā§ āϝāĻžā§āĨ¤
āϝāĻĻāĻŋ OX > OY āĻāĻŦāĻ X āĻŦāĻŋāύā§āĻĻā§āĻāĻŋ āĻŦā§āϤā§āϤā§āϰ āĻā§āϤāϰ⧠āĻĨāĻžāĻā§, āϤāĻŦā§ āĻĒā§āϰāĻŽāĻžāĻŖ āĻāϰā§āύ āϝ⧠Y āĻŦāĻŋāύā§āĻĻā§āĻāĻŋāĻ āĻŦā§āϤā§āϤā§āϰ āĻā§āϤāϰā§āĨ¤
Let O be the centre of a circle. A line intersects two parallel lines at X and Y and goes through the point O. Given that, OX > OY and X is inside the circle, prove that Y is also inside the circle.
3. āĻāĻāĻāĻŋ āĻāĻŖāĻŋāϤ āĻā§āϏāĻŦā§ ā§ā§¨āĻāĻŋ āĻŽā§āĻĄā§āϞ āĻĒā§āϰāĻĻāĻžāύ āĻāϰāĻž āĻšā§ā§āĻāĻŋāϞāĨ¤ āĻĒāϰāĻŦāϰā§āϤ⧠āϏāĻŽā§ā§ āĻšāĻŋāϏāĻžāĻŦā§āϰ āϏāĻŽā§ āĻĻā§āĻāĻž āĻā§āϞ, āϏā§āĻŽāύ āϰāĻŋāϏāĻŋāĻāĻāĻŋ āĻšāĻžāϰāĻŋā§ā§ āĻĢā§āϞā§āĻā§āĨ¤ āϏ⧠āĻŽāύ⧠āĻāϰāϤ⧠āĻĒā§āϰā§āĻā§ āϝ⧠āĻŽā§āĻĄā§āϞāĻā§āϞā§āϰ āĻŽā§āĻ āĻĻāĻžāĻŽ āĻāĻāĻāĻŋ āĻĒāĻžāĻāĻ āĻ āĻā§āĻā§āϰ āϏāĻāĻā§āϝāĻž āĻāĻŦāĻ āĻāϰ āĻŽāĻžāĻā§āϰ āϤāĻŋāύāĻāĻŋ āĻ āĻā§āĻāĻ ā§¯āĨ¤ āϝāĻĻāĻŋ āĻĒā§āϰāϤāĻŋāĻāĻŋ āĻŽā§āĻĄā§āϞā§āϰ āĻĻāĻžāĻŽ āϏāĻŽāĻžāύ āĻšā§ āĻāĻŦāĻ āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻž āĻšā§, āϤāĻžāĻšāϞ⧠āĻĒā§āϰāϤāĻŋ āĻŽā§āĻĄā§āϞā§āϰ āĻĻāĻžāĻŽ āĻāϤ?
At some math olympiad, 72 medals were handed out. Afterwards, it was found that Sumon had lost the receipt! He only remembers that the total price of the medals was a 5 digit number, and the three middle digits were all 9. If the price of all the medals were the same integer, what was the amount spent for each medal?
4. āĻā§ āĻŦāύā§āϧ⧠āĻāĻāϏāĻžāĻĨā§ āĻĄāĻžāϰā§āĻ āĻā§āĻā§ā§ āĻŽāĻžāϰāĻžāϰ āĻĒā§āϰāϤāĻŋāϝā§āĻāĻŋāϤāĻžā§ āĻ
āĻāĻļ āύā§ā§āĨ¤ āĻĄāĻžāϰā§āĻ āĻā§āϞāĻžā§ āĻāĻāĻāĻŋ āĻŦā§āϤā§āϤāĻžāĻāĻžāϰ āĻŦā§āϰā§āĻĄā§ āϞāĻā§āώā§āϝāĻā§āĻĻ āĻāϰāϤ⧠āĻšā§ āĻāĻŦāĻ āĻā§āύ āĻ
āĻāĻļā§ āĻĒāϰā§āĻā§ āϤāĻž āĻ
āύā§āϝāĻžā§ā§ āϏā§āĻā§āϰ āĻĒāĻžāĻā§āĻž āϝāĻžā§āĨ¤ āĻŦā§āϰā§āĻĄā§ ā§§ā§¨āĻāĻŋ āĻ
āĻāĻļ āϰā§ā§āĻā§, āϝā§āĻāĻžāύ⧠āĻŽāĻžāύ ā§§ āĻĨā§āĻ⧠⧧⧍ āĻĒāϰā§āϝāύā§āϤ āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻžāĨ¤
āĻāĻŽāĻžāĻĻā§āϰ āĻā§ āĻŦāύā§āϧā§āϰāĻž āĻĒā§āϰāϤā§āϝā§āĻā§ āĻĻā§āĻāĻŋ āĻāϰ⧠āĻĄāĻžāϰā§āĻ āύāĻŋāĻā§āώā§āĻĒ āĻāϰā§, āĻāĻŦāĻ āĻĒā§āϰāϤāĻŋāĻāĻŋ āĻĄāĻžāϰā§āĻ āĻŦāĻŋāĻāĻŋāύā§āύ āĻ
āĻāĻļā§ āĻāĻŋā§ā§ āĻĒā§ā§āĨ¤ āϤāĻžāĻĻā§āϰ āϏā§āĻā§āϰ:
– āϤāĻŋāĻšāĻžāĻŽ: ā§§ā§Ŧ āĻĒā§ā§āύā§āĻ
– āĻĻā§āĻĒā§āϤ: ā§Ē āĻĒā§ā§āύā§āĻ
– āϏāĻžāĻŽāĻŋāĻāϰ: ā§ āĻĒā§ā§āύā§āĻ
– āϏāĻžāĻŦā§āĻŦāĻŋāϰ: ā§§ā§§ āĻĒā§ā§āύā§āĻ
– āĻāĻļāϰāĻžāĻĢā§āϞ: ⧍⧧ āĻĒā§ā§āύā§āĻ
āĻ. āĻŽāĻžāĻšā§âāϰ āϏā§āĻā§āϰ āĻāϤ? (⧧⧍ āĻŽāĻžāϰā§āĻāϏ)
āĻ. ⧝ āĻĒā§ā§āύā§āĻā§āϰ āĻ
āĻāĻļā§ āĻāĻžāϰ āĻĄāĻžāϰā§āĻ āĻĒā§ā§āĻā§?
Six friends compete in a dart-throwing contest. Dart is played by throwing darts at a circularr board, with your score increasing based on which region of the board you hit. The board has 12 regions, with score values ranging through the integers from 1 to 12. Each of our six friends threw two darts, and each dart hits the target in a region with a different value. The scores are:
Tiham 16 points
Dipto 4 points
Samiur 7 points
Sabbir 11 points
Ashraful 21 points
a. What is Mahiâs score?
b. Who hits the region worth 9 points?
5. āĻāĻŋāϤā§āϰ⧠ABCD āĻāĻāĻāĻŋ āĻā§āϤāĻā§āώā§āϤā§āϰ āĻāĻŦāĻ ACEF āĻāĻāĻāĻŋ āĻŦāϰā§āĻāĻā§āώā§āϤā§āϰāĨ¤ āĻŦāϰā§āĻāĻā§āώā§āϤā§āϰā§āϰ āĻā§āώā§āϤā§āϰāĻĢāϞ ā§Ŧ⧍ā§Ģ āĻāĻŦāĻ āĻā§āϤāĻā§āώā§āϤā§āϰā§āϰ āĻĒāϰāĻŋāϏā§āĻŽāĻž ā§Ŧ⧍āĨ¤ āĻā§āϤāĻā§āώā§āϤā§āϰā§āϰ āĻĻā§āĻ āĻŦāĻžāĻšā§āϰ āĻĻā§āϰā§āĻā§āϝā§āϰ āĻĒāĻžāϰā§āĻĨāĻā§āϝ āĻāϤ?Â

In this figure ABCD is a rectangle and ACEF is a square. Area of the square is 625 and perimeter of the rectangle ABCD is 62. What is the difference between two sides of rectangle?
6. āĻāĻŽāĻ āϝāĻāύ āĻ
āĻĢāĻŋāϏ āĻĨā§āĻā§ āĻŦāĻžāϏāĻžā§ āĻĄā§āϰāĻžāĻāĻ āĻāϰā§, āϤāĻāύ āϏ⧠āĻŦāϰā§āĻŖāĻŽāĻžāϞāĻžāĻā§āĻā§ āϏā§āĻā§āϞ⧠āĻāĻŦāĻ āϤāĻžāϰ āϏā§āϤā§āϰā§āĻā§ āĻŦāĻŋāĻļā§āĻŦāĻŦāĻŋāĻĻā§āϝāĻžāϞā§ā§ āύāĻžāĻŽāĻžā§āĨ¤ āϤāĻžāϰāĻĒāϰ āϏ⧠āĻĒāĻžāϰā§āĻ⧠⧍ā§Ļ āĻŽāĻŋāύāĻŋāĻ āϧāϰ⧠āĻšāĻžāĻāĻā§ āĻāĻŦāĻ āĻļā§āώāĻŽā§āĻļ āĻ
āĻĢāĻŋāϏ⧠āϝāĻžā§āĨ¤
āϝāĻžāϤā§āϰāĻžāĻĒāĻĨ:
– āĻŦāĻžāϏāĻž â ā§ĒāĻāĻŋ āϰāĻžāϏā§āϤāĻž â āϏā§āĻā§āϞ â ā§ŠāĻāĻŋ āϰāĻžāϏā§āϤāĻž â āĻŦāĻŋāĻļā§āĻŦāĻŦāĻŋāĻĻā§āϝāĻžāϞ⧠â ā§ĢāĻāĻŋ āϰāĻžāϏā§āϤāĻž â āĻĒāĻžāϰā§āĻ â ⧍āĻāĻŋ āϰāĻžāϏā§āϤāĻž â āĻ
āĻĢāĻŋāϏ
āĻāĻāĻžāύ⧠āϤā§āĻŽāĻŋ āϤ⧠āĻāĻžāĻāϞ⧠āĻŦā§āĻŦ āĻāϰāϤ⧠āĻĒāĻžāϰāĻŦā§ āĻāĻŽāĻ āĻā§āϰā§āĻāĻŋ āĻāĻĒāĻžā§ā§ āϤāĻžāϰ āĻ āĻĢāĻŋāϏ⧠āĻĄā§āϰāĻžāĻāĻ āĻāϰ⧠āϝā§āϤ⧠āĻĒāĻžāϰā§, āϤāĻžāĻ āύāĻž? āĻāĻŋāύā§āϤ⧠āĻāĻŽāĻ āĻāĻāĻā§ āĻā§āϞā§āĻŽāύāĻžāĨ¤ āϏ⧠āϤāĻžāϰ āĻŦāĻžāϏāĻžā§ āĻāĻŋāĻā§ āĻā§āϞ⧠āϰā§āĻā§ āĻāϏāϤ⧠āĻĒāĻžāϰā§āĨ¤ āϏ⧠āĻŦāĻžāϏāĻžā§ āϝ⧠āĻā§āϞ⧠āϰā§āĻā§ āĻāϏā§āĻā§, āϏā§āĻāĻž āĻā§āύ āύāĻž āĻā§āύ āĻĨāĻžāĻŦāĻžāϰ āϏā§āĻĨāĻžāύ⧠āϤāĻžāϰāĻ āĻŽāύ⧠āĻĒā§ā§ (āϝā§āĻŽāύ āϏā§āĻā§āϞ) āĻāĻŦāĻ āϏā§āĻāĻž āύāĻŋā§ā§ āĻāϏāĻŦāĻžāϰ āĻāύā§āϝ āĻĢāĻŋāϰ⧠āϝāĻžā§āĨ¤ āϤāĻžāϰāĻĒāϰ āĻāĻŦāĻžāϰ āĻļā§āϰ⧠āĻĨā§āĻā§ āϝāĻžāϤā§āϰāĻž āĻāĻžāϞāĻŋā§ā§ āϝāĻžā§āĨ¤ āĻāĻŽāĻ āĻĻāĻŋāύ⧠āϏāϰā§āĻŦā§āĻā§āĻ āĻāĻāĻāĻŋ āĻāĻŋāύāĻŋāϏ āĻā§āϞā§, āĻāĻŦāĻ āϏ⧠āĻ āĻĢāĻŋāϏ⧠āĻĒā§āĻāĻā§ āĻā§āϞ⧠āϝāĻž āĻā§āϞ⧠āĻā§āĻā§ āϤāĻž āĻĢā§āϰāϤ āύā§āĻŦāĻžāϰ āĻāύā§āϝ āĻĢāĻŋāϰ⧠āϝāĻžā§āύāĻžāĨ¤ āĻāĻŦāĻžāϰ⧠āϤāĻžāϰ āĻĒāĻā§āώ⧠āĻāϤāĻā§āϞ⧠āĻā§āϰāĻŋāĻĒ āϰāĻžāϏā§āϤāĻž āύā§ā§āĻž āϏāĻŽā§āĻāĻŦ?
When Chamok drives to office from his home, he drops Barnomala at school and his wife Bohni at her university. Then, he goes to a park to walk for 20 minutes. (Yeah, he walks in a formal attire). Finally, he goes to his office. Letâs draw a simple map of his route.
Home â 4 ways â School â 3 ways â University â 5 ways â Park â 2 ways â Office
So, you can calculate in how many ways Chamok can drive to office, right? But, he has this forgetting habit. He might forget something at home. If he forgets something like this, he will remember it at a destination (say, at the school) and then drive back to collect it. Once he has collected the thing, he starts on his journey once again from the start. Chamok forgets at most one thing in a day, and if he has reached the office, he wonât get back to bring the thing. Now, calculate in how many different ways he might go to office under these conditions.
7. 2, 3, 5, 6, 7, 10, 11, 12, 13, . . . āĻāĻ āϧāĻžāϰāĻžāĻāĻŋ āĻšāϞ⧠āĻāĻŽāύ āϏāĻāĻā§āϝāĻž āϝā§āĻā§āϞ⧠āĻĒā§āϰā§āĻŖ āĻŦāϰā§āĻ āĻŦāĻž āĻĒā§āϰā§āĻŖ āĻāύ āϏāĻāĻā§āϝāĻž āύā§āĨ¤ āϧāĻžāϰāĻžāĻāĻŋāϰ ⧍ā§Ļ⧧⧝āϤāĻŽ āϏāĻāĻā§āϝāĻž āĻā§āύāĻāĻŋ?
2; 3; 5; 6; 7; 10; 11; 12; 13; : : : is the sequence of integers without all square and cube numbers. What is the 2019th number?
8. āĻāĻŋāϤā§āϰ⧠āĻā§āĻ āĻāĻŦāĻ āĻŦā§ āĻŦā§āϤā§āϤā§āϰ āĻŦā§āϝāĻžāϏāĻžāϰā§āϧ āϝāĻĨāĻžāĻā§āϰāĻŽā§ ā§§ āĻāĻŦāĻ ā§ŠāĨ¤ āϝāĻĻāĻŋ āĻā§āĻ āĻŦā§āϤā§āϤāĻāĻŋ āĻŦā§ āĻŦā§āϤā§āϤā§āϰ āĻāĻžāϰāĻĒāĻžāĻļā§ āĻŦāĻžāĻŽā§ āĻĨā§āĻā§ āĻĄāĻžāύ⧠āĻā§āϰ⧠āϝāĻžā§, āϤāĻŦā§ āĻŦā§ āĻŦā§āϤā§āϤā§āϰ āĻĒāϰāĻŋāϧāĻŋāϰ āĻāϤāĻā§āĻā§ āĻ āĻāĻļ āĻāĻāĻŋ āĻ āϤāĻŋāĻā§āϰāĻŽ āĻāϰāĻŦā§?

In figure, the small and big circles have a radius of 1 and 3 respectively. If the small circle revolves round the big circle according to the figure from left to right, what portion of the circumference of the big circle it will cover?
Junior Catagory
1. āĻĢāĻžāϰāĻšāĻžāύ āϤāĻžāϰ āĻĒāϰā§āĻā§āώāĻžāϰ āύāĻŽā§āĻŦāϰ āĻŽā§ā§āĻžāĻ, āĻŦā§āώā§āĻāĻŋ, āĻāĻŦāĻ āĻŽā§āϰāϏāĻžāϞāĻŋāύāĻā§ āĻĻā§āĻāĻžāϞā§, āĻāĻŋāύā§āϤ⧠āĻ āύā§āϝ āϏāĻŦāĻžāĻ āϤāĻžāĻĻā§āϰ āύāĻŋāĻā§āϰ āύāĻŽā§āĻŦāϰ āϞā§āĻāĻŋā§ā§ āϰāĻžāĻāϞāĨ¤ āĻŽā§ā§āĻžāĻ āĻŽāύ⧠āĻāϰāϞā§, “āĻāĻŽāĻĒāĻā§āώ⧠āĻāĻŽāĻžāĻĻā§āϰ āĻŽāϧā§āϝ⧠āĻĻā§āĻāĻāύā§āϰ āύāĻŽā§āĻŦāϰ āϏāĻŽāĻžāύāĨ¤” āĻŦā§āώā§āĻāĻŋ āĻŽāύ⧠āĻāϰāϞā§, “āĻāĻŽāĻŋ āϏāĻŦāĻā§ā§ā§ āĻāĻŽ āύāĻŽā§āĻŦāϰ āĻĒāĻžāĻāύāĻŋāĨ¤” āĻŽā§āϰāϏāĻžāϞāĻŋāύ āĻŽāύ⧠āĻāϰāϞā§, “āĻāĻŽāĻŋ āϏāĻŦāĻā§ā§ā§ āĻŦā§āĻļāĻŋ āύāĻŽā§āĻŦāϰ āĻĒāĻžāĻāύāĻŋāĨ¤”
āĻ. āĻā§ āϏāĻŦāĻā§ā§ā§ āĻŦā§āĻļāĻŋ āύāĻŽā§āĻŦāϰ āĻĒā§ā§ā§āĻā§?
āĻ. āĻā§ āϏāĻŦāĻā§ā§ā§ āĻāĻŽ āύāĻŽā§āĻŦāϰ āĻĒā§ā§ā§āĻā§?
Farhan shows his test score to Muaz, Bristy and Mursalin, but everyone else keeps it hidden. Muaz thinks, âAt least two of us get same scoresâ Bristy thinks, âI didnât get the lowest score.â Mursalin thinks, âI didnât get the highest score.â
a. Who got the highest marks? (6 marks)
b. Who got the lowest marks?
2. āĻā§ āĻŦāύā§āϧ⧠āĻāĻāϏāĻžāĻĨā§ āĻĄāĻžāϰā§āĻ āĻā§āĻā§ā§ āĻŽāĻžāϰāĻžāϰ āĻĒā§āϰāϤāĻŋāϝā§āĻāĻŋāϤāĻžā§ āĻ
āĻāĻļ āύā§ā§āĨ¤ āĻĄāĻžāϰā§āĻ āĻā§āϞāĻžā§ āĻāĻāĻāĻŋ āĻŦā§āϤā§āϤāĻžāĻāĻžāϰ āĻŦā§āϰā§āĻĄā§ āϞāĻā§āώā§āϝāĻā§āĻĻ āĻāϰāϤ⧠āĻšā§ āĻāĻŦāĻ āĻā§āύ āĻ
āĻāĻļā§ āĻĒāϰā§āĻā§ āϤāĻž āĻ
āύā§āϝāĻžā§ā§ āϏā§āĻā§āϰ āĻĒāĻžāĻā§āĻž āϝāĻžā§āĨ¤ āĻŦā§āϰā§āĻĄā§ ā§§ā§¨āĻāĻŋ āĻ
āĻāĻļ āϰā§ā§āĻā§, āϝā§āĻāĻžāύ⧠āĻŽāĻžāύ ā§§ āĻĨā§āĻ⧠⧧⧍ āĻĒāϰā§āϝāύā§āϤ āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻžāĨ¤
āĻāĻŽāĻžāĻĻā§āϰ āĻā§ āĻŦāύā§āϧā§āϰāĻž āĻĒā§āϰāϤā§āϝā§āĻā§ āĻĻā§āĻāĻŋ āĻāϰ⧠āĻĄāĻžāϰā§āĻ āύāĻŋāĻā§āώā§āĻĒ āĻāϰā§, āĻāĻŦāĻ āĻĒā§āϰāϤāĻŋāĻāĻŋ āĻĄāĻžāϰā§āĻ āĻŦāĻŋāĻāĻŋāύā§āύ āĻ
āĻāĻļā§ āĻāĻŋā§ā§ āĻĒā§ā§āĨ¤ āϤāĻžāĻĻā§āϰ āϏā§āĻā§āϰ:
– āϤāĻŋāĻšāĻžāĻŽ: ā§§ā§Ŧ āĻĒā§ā§āύā§āĻ
– āĻĻā§āĻĒā§āϤ: ā§Ē āĻĒā§ā§āύā§āĻ
– āϏāĻžāĻŽāĻŋāĻāϰ: ā§ āĻĒā§ā§āύā§āĻ
– āϏāĻžāĻŦā§āĻŦāĻŋāϰ: ā§§ā§§ āĻĒā§ā§āύā§āĻ
– āĻāĻļāϰāĻžāĻĢā§āϞ: ⧍⧧ āĻĒā§ā§āύā§āĻ
āĻ. āĻŽāĻžāĻšā§âāϰ āϏā§āĻā§āϰ āĻāϤ? (⧧⧍ āĻŽāĻžāϰā§āĻāϏ)
āĻ. ⧝ āĻĒā§ā§āύā§āĻā§āϰ āĻ
āĻāĻļā§ āĻāĻžāϰ āĻĄāĻžāϰā§āĻ āĻĒā§ā§āĻā§?
Six friends compete in a dart-throwing contest. Dart is played by throwing darts at a circularr board, with your score increasing based on which region of the board you hit. The board has 12 regions, with score values ranging through the integers from 1 to 12. Each of our six friends threw two darts, and each dart hits the target in a region with a different value. The scores are:
Tiham 16 points
Dipto 4 points
Samiur 7 points
Sabbir 11 points
Ashraful 21 points
a. What is Mahiâs score?
b. Who hits the region worth 9 points?
3. āĻāĻāĻāĻŋ āĻāĻŋāϤā§āϰ⧠ABCD āĻāĻāĻāĻŋ āĻā§āϤāĻā§āώā§āϤā§āϰ āĻāĻŦāĻ EFGH āĻāĻāĻāĻŋ āϏāĻžāĻŽāĻžāύā§āϤāϰāĻŋāĻāĨ¤ DI āĻāĻŦāĻ EF āĻĒāϰāϏā§āĻĒāϰ āϞāĻŽā§āĻŦ āĻāĻŦāĻ BK āĻāĻŦāĻ HG āĻĒāϰāϏā§āĻĒāϰ āϞāĻŽā§āĻŦāĨ¤ āĻāĻŋāϤā§āϰ⧠āĻĻā§āĻā§āĻž āĻĒāϰāĻŋāĻŽāĻžāĻĒāĻā§āϞ⧠āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻāϰ⧠DI āĻāϰ āĻŽāĻžāύ āύāĻŋāϰā§āĻŖā§ āĻāϰāĨ¤

In the figure, ABCD is a rectangle and EFGH is a parallelogram. DI is perpendicular to EF and BK is perpendicular to HG. Using the measurements given in the figure, find the value of DI.
4. n āĻāĻāĻāĻŋ āϧāύāĻžāϤā§āĻŽāĻ āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻž āϝāĻžāϤ⧠⧍ā§Ļ⧧⧝ + n! āĻāĻāĻāĻŋ āĻĒā§āϰā§āĻŖāĻŦāϰā§āĻāĨ¤ n āĻāϰ āϏāĻāϞ āϏāĻŽā§āĻāĻŦ āĻŽāĻžāύ āύāĻŋāϰā§āĻŖā§ āĻāϰāĨ¤
āĻāĻāĻžāύā§, n! = n à (nâ1) à (nâ2) à … Ã ā§¨ Ã ā§§āĨ¤ āĻāĻĻāĻžāĻšāϰāĻŖāϏā§āĻŦāϰā§āĻĒ – ā§Ē! = ā§Ē Ã ā§Š Ã⧍ Ã ā§§ = ⧍ā§Ē.
n is a positive integer such that 2019 + n! is a square number. Find all such values of n.Here, n! = n (n – 1) (n – 2)…..2 Ã 1. For example, 4! = 4 Ã 3 Ã2 Ã 1 = 24.
5. ⧍, ā§Š, ā§Ģ, ā§Ŧ, ā§, ā§§ā§Ļ, ā§§ā§§, ⧧⧍, ā§§ā§Š, … āϝāĻĻāĻŋ āϏā§āĻāϏāĻŦ āϏā§āĻŦāĻžāĻāĻžāĻŦāĻŋāĻ āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻžāϰ āϧāĻžāϰāĻž āĻšā§, āϝāĻžāϰāĻž āĻĒā§āϰā§āĻŖ āĻŦāϰā§āĻ āĻ āĻĨāĻŦāĻž āĻĒā§āϰā§āĻŖ āĻāύ āϏāĻāĻā§āϝāĻž āύā§, āϤāĻŦ⧠⧍ā§Ļ⧧⧝āϤāĻŽ āĻĒāĻĻ āĻā§āύāĻāĻŋ?
2; 3, 5, 6, 7, 10, 11, 12, 13, ……….is the sequence of integers without all square and cube numbers. What is the 2019th number?
6. āĻāĻŋāϤā§āϰ⧠ABCD āĻāĻāĻāĻŋ āĻā§āϰāĻžāĻĒāĻŋāĻāĻŋā§āĻžāĻŽ āϝāĻžāϤ⧠AB || CDāĨ¤ P, Q, R, S āϝāĻĨāĻžāĻā§āϰāĻŽā§ AB, BD, DC, CA āĻāϰ āĻŽāϧā§āϝ āĻŦāĻŋāύā§āĻĻā§āĨ¤ AC āĻāĻŦāĻ BD O āĻŦāĻŋāύā§āĻĻā§āϤ⧠āĻā§āĻĻ āĻāϰā§āĨ¤ âŗAOB āĻāϰ āĻā§āώā§āϤā§āϰāĻĢāϞ ⧍ā§Ļ⧧⧝ āĻāĻŦāĻ âŗCOD āĻāϰ āĻā§āώā§āϤā§āϰāĻĢāϞ ⧍ā§Ļ⧍ā§ĻāĨ¤ āĻāϤā§āϰā§āĻā§āĻ PQRS āĻāϰ āĻā§āώā§āϤā§āϰāĻĢāϞ āĻāϤ?

In this figure ABCD is a trapezium where ABjjCD. P; Q;R; S are the midpoint of AB;BD;DC;CA respectively. AC and BD intersect at point O. Area of âŗAOB = 2019 and area of âŗCOD = 2020 .What is the area of quadrilateral PQRS?
7. āĻĻāĻžāĻŦāĻžā§ āĻāĻāĻāĻŋ āύā§āĻāĻž āĻļā§āϧ⧠āĻāĻĒāϰ-āύāĻŋāĻ āĻŦāĻž āĻĄāĻžāύ-āĻŦāĻžāĻŽā§ āϝā§āϤ⧠āĻĒāĻžāϰā§, āĻā§āύāĻžāĻā§āύāĻŋ āύā§āĨ¤ āĻāĻŽāϰāĻž āĻāĻāĻāĻŋ āĻĻāĻžāĻŦāĻžāϰ āύā§āĻāĻžāϰ āϤāϞāĻžāϰ āĻ āĻāĻļāĻāĻŋ āϞāĻžāϞ āϰāĻ āĻāϰā§āĻāĻŋāĨ¤ āĻāĻāύ āϏ⧠āϝāĻāύ āĻā§āύ āĻāĻžāϞ āĻĻā§ā§, āϤāĻāύ āĻļā§āϰ⧠āĻāĻŦāĻ āĻļā§āώ āĻāϰ āĻ āϤāĻžāϰ āĻŽāĻžāĻāĻžāĻŽāĻžāĻāĻŋ āϏāĻŦ āĻāϰāĻā§ āϞāĻžāϞ āϰāĻ āĻāϰ⧠āĻĢā§āϞā§āĨ¤ āĻĒā§āϰāĻŽāĻžāĻŖ āĻāϰ, āĻāĻāĻāĻŋ n à n āĻĻāĻžāĻŦāĻžāĻŦā§āϰā§āĻĄā§āϰ āϏāĻŦāĻā§āϞ⧠āĻāϰāĻā§ āϞāĻžāϞ āϰāĻ āĻāϰāϤ⧠āĻāĻŽāύ āĻāĻāĻāĻŋ āύā§āĻāĻžāϰ āĻāĻŽāĻĒāĻā§āώ⧠2nâ1 āĻāĻžāϞ āĻĻāĻŋāϤ⧠āĻšāĻŦā§āĨ¤
A chess rook can only travel horizontally or vertically, but not diagonally. We color the bottom of a chess rook red. So, when it makes a move it paints all the squares it travels over red. Prove that, a rook will need at least 2n – 1 moves to every square of an n à n chess board red.
8. M āĻāĻŦāĻ N āĻĻā§āĻāĻāĻŋ āϧāύāĻžāϤā§āĻŽāĻ āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻž āϝāĻžāϤ⧠M āĻāĻŦāĻ N āĻ āϏāĻŽāĻžāύāĨ¤ M āĻāĻŦāĻ N āĻāϰ āϞāϏāĻžāĻā§ āĻšāϞ⧠\[M^2âN^2+MN \]āĨ¤ āĻĻā§āĻāĻžāĻ āϝ⧠MN āĻāĻāĻāĻŋ āĻāύ āϏāĻāĻā§āϝāĻžāĨ¤
M and N are two positive integers where M is not equal to N . LCM of (M and N ) = \[M^2âN^2+MN \]. Show that MN is a perfect cubic number.
9. āĻāĻžāϰā§āĻā§āϏā§ā§ āϏā§āĻĨāĻžāύāĻžāĻā§āĻ āĻŦā§āϝāĻŦāϏā§āĻĨāĻžā§ āĻāĻžāϰāĻāĻŋ āĻŦāĻŋāύā§āĻĻā§ (0, 0), (20, 0), (20, 19), āĻāĻŦāĻ (0, 19) āĻĻāĻŋā§ā§ āĻāĻāĻāĻŋ āĻā§āϤ āĻāĻāĻāĻž āĻšāϞā§āĨ¤ āĻļā§āϰā§āϤ⧠(0, 0) āĻŦāĻŋāύā§āĻĻā§āϤ⧠āĻāĻāĻāĻŋ āĻŦāϞ (āĻŦāϞā§āϰ āĻāĻāĻžāϰ āĻ āĻā§āϰāĻžāĻšā§āϝ) āĻāĻā§āĨ¤ āĻŦāϞāĻāĻŋ (0, 0) āĻŦāĻŋāύā§āĻĻā§ āĻĨā§āĻā§ (2, 1) āĻŦāĻŋāύā§āĻĻā§āϰ āĻĻā§āϰā§āϤā§āĻŦ āϝāϤ āĻŦāϞāĻāĻŋ āĻĒā§āϰāϤāĻŋ āϏā§āĻā§āύā§āĻĄ āϤāϤ āĻĻā§āϰā§āϤā§āĻŦ āĻ āϤāĻŋāĻā§āϰāĻŽ āĻāϰā§āĨ¤ āĻŦāϞāĻāĻŋ āĻā§āϤāĻā§āώā§āϤā§āϰā§āϰ āĻŦāĻžāĻšā§āϤ⧠āϧāĻžāĻā§āĻāĻž āĻā§āϞ⧠āĻĒā§āϰāϤāĻŋāĻĢāϞāύā§āϰ āϏā§āϤā§āϰāĻžāύā§āϝāĻžā§ā§ āĻĢāĻŋāϰ⧠āϝāĻžā§āĨ¤ āĻŦāϞāĻāĻŋ āĻā§āϤāĻā§āώā§āϤā§āϰā§āϰ āĻā§āύāĻžā§ āϧāĻžāĻā§āĻāĻž āĻā§āϞ⧠āĻĒā§āϰāϤāĻŋāĻĢāϞāύā§āϰ āϏā§āϤā§āϰāĻžāύā§āϝāĻžā§ā§ āϝ⧠āĻĻāĻŋāĻ āĻĨā§āĻā§ āĻāϏāĻāĻŋāϞ āϏā§āĻĻāĻŋāĻā§ āĻĢāĻŋāϰ⧠āϝāĻžā§āĨ¤ āĻāĻāĻžāĻŦā§ āĻŦāϞāĻāĻŋ āϏāĻŦāϏāĻŽā§ āĻā§āϤā§āϰ āĻŽāϧā§āϝā§āĻ āĻĨāĻžāĻā§āĨ¤ āĻŦāϞāĻāĻŋ āĻļā§āϰ⧠āĻĨā§āĻ⧠⧍ā§Ļ⧧⧝ āϏā§āĻā§āύā§āĻĄ āĻāϰ āĻāĻ āĻĒāϰā§āϝāύā§āϤ āĻāϤāĻŦāĻžāϰ āĻā§āϤā§āϰ āĻā§āύ⧠āύāĻž āĻā§āύ⧠āĻā§āύāĻŋāĻ āĻŦāĻŋāύā§āĻĻā§āϤ⧠āϧāĻžāĻā§āĻāĻž āĻāĻžāĻŦā§?
In the cartesian coordinate system, four points (0; 0); (20; 0); (20; 19) and (0; 19) are used as vertices to draw a rectangle. At first, a ball with negligible size is at the (0; 0) point. It then started to move towards the point (2; 1). Every second, the ball passes the amount of distance between (0; 0) to (2; 1). If it collides with one side of the rectangle, it follows the law of reflection and comes back to the rectangle. If it collides with a corner, it again follows the law of reflection and comes back in the direction it went in. Until the 2019th second, how many times will the ball collide with a corner point?
10. āϤāĻŋāύāĻāĻŋ āĻāĻāĻ āĻā§āύā§āĻĻā§āϰāĻŦāĻŋāĻļāĻŋāώā§āĻ āĻŦā§āϤā§āϤ \[\omega_1, \omega_2, \omega_3\] āĻĻā§āĻā§āĻž āĻāĻā§ āϝāĻžāĻĻā§āϰ āĻŦā§āϝāĻžāϏāĻžāϰā§āϧ āϝāĻĨāĻžāĻā§āϰāĻŽā§ \[r_1, r_2, r_3\] āĻāĻŦāĻ \[r_1 + r_3 \geq 2r_2\]āĨ¤
āĻāĻŽāύ āĻāĻāĻāĻŋ āϰā§āĻāĻž āĻ
āĻā§āĻāύ āĻāϰ āϝā§āĻāĻŋ \[\omega_1, \omega_2, \omega_3\]-āĻā§ āϝāĻĨāĻžāĻā§āϰāĻŽā§ A, B, C āĻŦāĻŋāύā§āĻĻā§āϤ⧠āĻā§āĻĻ āĻāϰ⧠āϝāĻžāϤ⧠AB = BCāĨ¤

Given three concentric circles \[\omega_1, \omega_2, \omega_3\] with radius \[r_1, r_2, r_3\] such that latex]r_1 + r_3 \geq 2r_2[/latex],construct a line that intersects \[\omega_1, \omega_2, \omega_3\] at A;B;C respectively such that AB = BC.

