BD math Olympiad 2019 national questions

 

Primary Category

1. āĻĢāĻžāϰāĻšāĻžāύ āϤāĻžāϰ āĻĒāϰ⧀āĻ•ā§āώāĻžāϰ āύāĻŽā§āĻŦāϰ āĻŽā§ā§ŸāĻžāϜ, āĻŦ⧃āĻˇā§āϟāĻŋ, āĻāĻŦāĻ‚ āĻŽā§āϰāϏāĻžāϞāĻŋāύāϕ⧇ āĻĻ⧇āĻ–āĻžāϞ⧋, āĻ•āĻŋāĻ¨ā§āϤ⧁ āĻ…āĻ¨ā§āϝ āϏāĻŦāĻžāχ āϤāĻžāĻĻ⧇āϰ āύāĻŋāĻœā§‡āϰ āύāĻŽā§āĻŦāϰ āϞ⧁āĻ•āĻŋā§Ÿā§‡ āϰāĻžāĻ–āϞāĨ¤ āĻŽā§ā§ŸāĻžāϜ āĻŽāύ⧇ āĻ•āϰāϞ⧋, “āĻ•āĻŽāĻĒāĻ•ā§āώ⧇ āφāĻŽāĻžāĻĻ⧇āϰ āĻŽāĻ§ā§āϝ⧇ āĻĻ⧁āχāϜāύ⧇āϰ āύāĻŽā§āĻŦāϰ āϏāĻŽāĻžāύāĨ¤” āĻŦ⧃āĻˇā§āϟāĻŋ āĻŽāύ⧇ āĻ•āϰāϞ⧋, “āφāĻŽāĻŋ āϏāĻŦāĻšā§‡ā§Ÿā§‡ āĻ•āĻŽ āύāĻŽā§āĻŦāϰ āĻĒāĻžāχāύāĻŋāĨ¤” āĻŽā§āϰāϏāĻžāϞāĻŋāύ āĻŽāύ⧇ āĻ•āϰāϞ⧋, “āφāĻŽāĻŋ āϏāĻŦāĻšā§‡ā§Ÿā§‡ āĻŦ⧇āĻļāĻŋ āύāĻŽā§āĻŦāϰ āĻĒāĻžāχāύāĻŋāĨ¤”

āĻ•. āϕ⧇ āϏāĻŦāĻšā§‡ā§Ÿā§‡ āĻŦ⧇āĻļāĻŋ āύāĻŽā§āĻŦāϰ āĻĒā§‡ā§Ÿā§‡āϛ⧇?
āĻ–. āϕ⧇ āϏāĻŦāĻšā§‡ā§Ÿā§‡ āĻ•āĻŽ āύāĻŽā§āĻŦāϰ āĻĒā§‡ā§Ÿā§‡āϛ⧇?

Farhan shows his test score to Muaz, Bristy and Mursalin, but everyone else keeps it hidden. Muaz thinks, “At least two of us get same scores” Bristy thinks, “I didn’t get the lowest score.” Mursalin thinks, “I didn’t get the highest score.”
a. Who got the highest marks? (6 marks)
b. Who got the lowest marks?

2. O āĻšāϞ⧋ āĻāĻ•āϟāĻŋ āĻŦ⧃āĻ¤ā§āϤ⧇āϰ āϕ⧇āĻ¨ā§āĻĻā§āϰāĨ¤ āĻāĻ•āϟāĻŋ āϏāϰāϞāϰ⧇āĻ–āĻž āĻĻ⧁āχāϟāĻŋ āĻĒāϰāĻ¸ā§āĻĒāϰ āϏāĻŽāĻžāĻ¨ā§āϤāϰāĻžāϞ āϰ⧇āĻ–āĻžāϕ⧇ X āĻ“ Y āĻŦāĻŋāĻ¨ā§āĻĻ⧁āϤ⧇ āϛ⧇āĻĻ āĻ•āϰ⧇ āĻāĻŦāĻ‚ O āĻŦāĻŋāĻ¨ā§āĻĻ⧁āϰ āĻŽāĻ§ā§āϝ āĻĻāĻŋā§Ÿā§‡ āϝāĻžā§ŸāĨ¤
āϝāĻĻāĻŋ OX > OY āĻāĻŦāĻ‚ X āĻŦāĻŋāĻ¨ā§āĻĻ⧁āϟāĻŋ āĻŦ⧃āĻ¤ā§āϤ⧇āϰ āϭ⧇āϤāϰ⧇ āĻĨāĻžāϕ⧇, āϤāĻŦ⧇ āĻĒā§āϰāĻŽāĻžāĻŖ āĻ•āϰ⧁āύ āϝ⧇ Y āĻŦāĻŋāĻ¨ā§āĻĻ⧁āϟāĻŋāĻ“ āĻŦ⧃āĻ¤ā§āϤ⧇āϰ āϭ⧇āϤāϰ⧇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. āĻāĻ•āϟāĻŋ āĻ—āĻŖāĻŋāϤ āĻ‰ā§ŽāϏāĻŦ⧇ ⧭⧍āϟāĻŋ āĻŽā§‡āĻĄā§‡āϞ āĻĒā§āϰāĻĻāĻžāύ āĻ•āϰāĻž āĻšā§Ÿā§‡āĻ›āĻŋāϞāĨ¤ āĻĒāϰāĻŦāĻ°ā§āϤ⧀ āϏāĻŽā§Ÿā§‡ āĻšāĻŋāϏāĻžāĻŦ⧇āϰ āϏāĻŽā§Ÿ āĻĻ⧇āĻ–āĻž āϗ⧇āϞ, āϏ⧁āĻŽāύ āϰāĻŋāϏāĻŋāϟāϟāĻŋ āĻšāĻžāϰāĻŋā§Ÿā§‡ āĻĢ⧇āϞ⧇āϛ⧇āĨ¤ āϏ⧇ āĻŽāύ⧇ āĻ•āϰāϤ⧇ āĻĒ⧇āϰ⧇āϛ⧇ āϝ⧇ āĻŽā§‡āĻĄā§‡āϞāϗ⧁āϞ⧋āϰ āĻŽā§‹āϟ āĻĻāĻžāĻŽ āĻāĻ•āϟāĻŋ āĻĒāĻžāρāϚ āĻ…āĻ™ā§āϕ⧇āϰ āϏāĻ‚āĻ–ā§āϝāĻž āĻāĻŦāĻ‚ āĻāϰ āĻŽāĻžāĻā§‡āϰ āϤāĻŋāύāϟāĻŋ āĻ…āĻ™ā§āĻ•āχ ⧝āĨ¤ āϝāĻĻāĻŋ āĻĒā§āϰāϤāĻŋāϟāĻŋ āĻŽā§‡āĻĄā§‡āϞ⧇āϰ āĻĻāĻžāĻŽ āϏāĻŽāĻžāύ āĻšā§Ÿ āĻāĻŦāĻ‚ āĻĒā§‚āĻ°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻž āĻšā§Ÿ, āϤāĻžāĻšāϞ⧇ āĻĒā§āϰāϤāĻŋ āĻŽā§‡āĻĄā§‡āϞ⧇āϰ āĻĻāĻžāĻŽ āĻ•āϤ?

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. āĻ›ā§Ÿ āĻŦāĻ¨ā§āϧ⧁ āĻāĻ•āϏāĻžāĻĨ⧇ āĻĄāĻžāĻ°ā§āϟ āϛ⧁āĻā§œā§‡ āĻŽāĻžāϰāĻžāϰ āĻĒā§āϰāϤāĻŋāϝ⧋āĻ—āĻŋāϤāĻžā§Ÿ āĻ…āĻ‚āĻļ āĻ¨ā§‡ā§ŸāĨ¤ āĻĄāĻžāĻ°ā§āϟ āϖ⧇āϞāĻžā§Ÿ āĻāĻ•āϟāĻŋ āĻŦ⧃āĻ¤ā§āϤāĻžāĻ•āĻžāϰ āĻŦā§‹āĻ°ā§āĻĄā§‡ āϞāĻ•ā§āĻˇā§āϝāϭ⧇āĻĻ āĻ•āϰāϤ⧇ āĻšā§Ÿ āĻāĻŦāĻ‚ āϕ⧋āύ āĻ…āĻ‚āĻļ⧇ āĻĒāϰ⧇āϛ⧇ āϤāĻž āĻ…āύ⧁āϝāĻžā§Ÿā§€ āĻ¸ā§āϕ⧋āϰ āĻĒāĻžāĻ“ā§ŸāĻž āϝāĻžā§ŸāĨ¤ āĻŦā§‹āĻ°ā§āĻĄā§‡ ⧧⧍āϟāĻŋ āĻ…āĻ‚āĻļ āĻ°ā§Ÿā§‡āϛ⧇, āϝ⧇āĻ–āĻžāύ⧇ āĻŽāĻžāύ ā§§ āĻĨ⧇āϕ⧇ ⧧⧍ āĻĒāĻ°ā§āϝāĻ¨ā§āϤ āĻĒā§‚āĻ°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻžāĨ¤
āφāĻŽāĻžāĻĻ⧇āϰ āĻ›ā§Ÿ āĻŦāĻ¨ā§āϧ⧁āϰāĻž āĻĒā§āϰāĻ¤ā§āϝ⧇āϕ⧇ āĻĻ⧁āϟāĻŋ āĻ•āϰ⧇ āĻĄāĻžāĻ°ā§āϟ āύāĻŋāĻ•ā§āώ⧇āĻĒ āĻ•āϰ⧇, āĻāĻŦāĻ‚ āĻĒā§āϰāϤāĻŋāϟāĻŋ āĻĄāĻžāĻ°ā§āϟ āĻŦāĻŋāĻ­āĻŋāĻ¨ā§āύ āĻ…āĻ‚āĻļ⧇ āĻ—āĻŋā§Ÿā§‡ āĻĒā§œā§‡āĨ¤ āϤāĻžāĻĻ⧇āϰ āĻ¸ā§āϕ⧋āϰ:
– āϤāĻŋāĻšāĻžāĻŽ: ā§§ā§Ŧ āĻĒā§Ÿā§‡āĻ¨ā§āϟ
– āĻĻā§€āĻĒā§āϤ: ā§Ē āĻĒā§Ÿā§‡āĻ¨ā§āϟ
– āϏāĻžāĻŽāĻŋāωāϰ: ā§­ āĻĒā§Ÿā§‡āĻ¨ā§āϟ
– āϏāĻžāĻŦā§āĻŦāĻŋāϰ: ā§§ā§§ āĻĒā§Ÿā§‡āĻ¨ā§āϟ
– āφāĻļāϰāĻžāĻĢ⧁āϞ: ⧍⧧ āĻĒā§Ÿā§‡āĻ¨ā§āϟ

āĻ•. āĻŽāĻžāĻšā§€â€™āϰ āĻ¸ā§āϕ⧋āϰ āĻ•āϤ? (⧧⧍ āĻŽāĻžāĻ°ā§āĻ•āϏ)
āĻ–. ⧝ āĻĒā§Ÿā§‡āĻ¨ā§āĻŸā§‡āϰ āĻ…āĻ‚āĻļ⧇ āĻ•āĻžāϰ āĻĄāĻžāĻ°ā§āϟ āĻĒā§œā§‡āϛ⧇?

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 Mahi’s score?
b. Who hits the region worth 9 points?

5. āϚāĻŋāĻ¤ā§āϰ⧇ ABCD āĻāĻ•āϟāĻŋ āĻ†ā§ŸāϤāĻ•ā§āώ⧇āĻ¤ā§āϰ āĻāĻŦāĻ‚ ACEF āĻāĻ•āϟāĻŋ āĻŦāĻ°ā§āĻ—āĻ•ā§āώ⧇āĻ¤ā§āϰāĨ¤ āĻŦāĻ°ā§āĻ—āĻ•ā§āώ⧇āĻ¤ā§āϰ⧇āϰ āĻ•ā§āώ⧇āĻ¤ā§āϰāĻĢāϞ ā§Ŧ⧍ā§Ģ āĻāĻŦāĻ‚ āĻ†ā§ŸāϤāĻ•ā§āώ⧇āĻ¤ā§āϰ⧇āϰ āĻĒāϰāĻŋāϏ⧀āĻŽāĻž ā§Ŧ⧍āĨ¤ āĻ†ā§ŸāϤāĻ•ā§āώ⧇āĻ¤ā§āϰ⧇āϰ āĻĻ⧁āχ āĻŦāĻžāĻšā§āϰ āĻĻ⧈āĻ°ā§āĻ˜ā§āϝ⧇āϰ āĻĒāĻžāĻ°ā§āĻĨāĻ•ā§āϝ āĻ•āϤ? 

 

BD math Olympiad 2019 national questions

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. āϚāĻŽāĻ• āϝāĻ–āύ āĻ…āĻĢāĻŋāϏ āĻĨ⧇āϕ⧇ āĻŦāĻžāϏāĻžā§Ÿ āĻĄā§āϰāĻžāχāĻ­ āĻ•āϰ⧇, āϤāĻ–āύ āϏ⧇ āĻŦāĻ°ā§āĻŖāĻŽāĻžāϞāĻžāϕ⧇āϕ⧇ āĻ¸ā§āϕ⧁āϞ⧇ āĻāĻŦāĻ‚ āϤāĻžāϰ āĻ¸ā§āĻ¤ā§āϰ⧀āϕ⧇ āĻŦāĻŋāĻļā§āĻŦāĻŦāĻŋāĻĻā§āϝāĻžāĻ˛ā§Ÿā§‡ āύāĻžāĻŽāĻžā§ŸāĨ¤ āϤāĻžāϰāĻĒāϰ āϏ⧇ āĻĒāĻžāĻ°ā§āϕ⧇ ⧍ā§Ļ āĻŽāĻŋāύāĻŋāϟ āϧāϰ⧇ āĻšāĻžāρāĻŸā§‡ āĻāĻŦāĻ‚ āĻļ⧇āώāĻŽā§‡āĻļ āĻ…āĻĢāĻŋāϏ⧇ āϝāĻžā§ŸāĨ¤
āϝāĻžāĻ¤ā§āϰāĻžāĻĒāĻĨ:
– āĻŦāĻžāϏāĻž → ā§ĒāϟāĻŋ āϰāĻžāĻ¸ā§āϤāĻž → āĻ¸ā§āϕ⧁āϞ → ā§ŠāϟāĻŋ āϰāĻžāĻ¸ā§āϤāĻž → āĻŦāĻŋāĻļā§āĻŦāĻŦāĻŋāĻĻā§āϝāĻžāϞ⧟ → ā§ĢāϟāĻŋ āϰāĻžāĻ¸ā§āϤāĻž → āĻĒāĻžāĻ°ā§āĻ• → ⧍āϟāĻŋ āϰāĻžāĻ¸ā§āϤāĻž → āĻ…āĻĢāĻŋāϏ

āĻāĻ–āĻžāύ⧇ āϤ⧁āĻŽāĻŋ āϤ⧋ āϚāĻžāχāϞ⧇ āĻŦ⧇āĻŦ āĻ•āϰāϤ⧇ āĻĒāĻžāϰāĻŦ⧇ āϚāĻŽāĻ• āĻ•ā§ŸāĻ°ā§āϟāĻŋ āωāĻĒāĻžā§Ÿā§‡ āϤāĻžāϰ āĻ…āĻĢāĻŋāϏ⧇ āĻĄā§āϰāĻžāχāĻ­ āĻ•āϰ⧇ āϝ⧇āϤ⧇ āĻĒāĻžāϰ⧇, āϤāĻžāχ āύāĻž? āĻ•āĻŋāĻ¨ā§āϤ⧁ āϚāĻŽāĻ• āĻāĻ•āϟ⧁ āϭ⧁āϞ⧋āĻŽāύāĻžāĨ¤ āϏ⧇ āϤāĻžāϰ āĻŦāĻžāϏāĻžā§Ÿ āĻ•āĻŋāϛ⧁ āϭ⧁āϞ⧇ āϰ⧇āϖ⧇ āφāϏāϤ⧇ āĻĒāĻžāϰ⧇āĨ¤ āϏ⧇ āĻŦāĻžāϏāĻžā§Ÿ āϝ⧇ āϭ⧁āϞ⧇ āϰ⧇āϖ⧇ āĻāϏ⧇āϛ⧇, āϏ⧇āϟāĻž āϕ⧋āύ āύāĻž āϕ⧋āύ āĻĨāĻžāĻŦāĻžāϰ āĻ¸ā§āĻĨāĻžāύ⧇ āϤāĻžāϰāχ āĻŽāύ⧇ āĻĒā§œā§‡ (āϝ⧇āĻŽāύ āĻ¸ā§āϕ⧁āϞ) āĻāĻŦāĻ‚ āϏ⧇āϟāĻž āύāĻŋā§Ÿā§‡ āφāϏāĻŦāĻžāϰ āϜāĻ¨ā§āϝ āĻĢāĻŋāϰ⧇ āϝāĻžā§ŸāĨ¤ āϤāĻžāϰāĻĒāϰ āφāĻŦāĻžāϰ āĻļ⧁āϰ⧁ āĻĨ⧇āϕ⧇ āϝāĻžāĻ¤ā§āϰāĻž āϚāĻžāϞāĻŋā§Ÿā§‡ āϝāĻžā§ŸāĨ¤ āϚāĻŽāĻ• āĻĻāĻŋāύ⧇ āϏāĻ°ā§āĻŦā§‹āĻšā§āϚ āĻāĻ•āϟāĻŋ āϜāĻŋāύāĻŋāϏ āϭ⧁āϞ⧇, āĻāĻŦāĻ‚ āϏ⧇ āĻ…āĻĢāĻŋāϏ⧇ āĻĒ⧌āρāϛ⧇ āϗ⧇āϞ⧇ āϝāĻž āϭ⧁āϞ⧇ āϗ⧇āϛ⧇ āϤāĻž āĻĢ⧇āϰāϤ āύ⧇āĻŦāĻžāϰ āϜāĻ¨ā§āϝ āĻĢāĻŋāϰ⧇ āϝāĻžā§ŸāύāĻžāĨ¤ āĻāĻŦāĻžāϰ⧇ āϤāĻžāϰ āĻĒāĻ•ā§āώ⧇ āĻ•āϤāϗ⧁āϞ⧋ āĻŸā§āϰāĻŋāĻĒ āϰāĻžāĻ¸ā§āϤāĻž āĻ¨ā§‹ā§ŸāĻž 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. Let’s draw a simple map of his route.

Home → 4 ways → School → 3 ways → University → 5 ways → Park → 2 ways → 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 won’t 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, . . . āĻāχ āϧāĻžāϰāĻžāϟāĻŋ āĻšāϞ⧋ āĻāĻŽāύ āϏāĻ‚āĻ–ā§āϝāĻž āϝ⧇āϗ⧁āϞ⧋ āĻĒā§‚āĻ°ā§āĻŖ āĻŦāĻ°ā§āĻ— āĻŦāĻž āĻĒā§‚āĻ°ā§āĻŖ āϘāύ āϏāĻ‚āĻ–ā§āϝāĻž āύ⧟āĨ¤ āϧāĻžāϰāĻžāϟāĻŋāϰ ⧍ā§Ļ⧧⧝āϤāĻŽ āϏāĻ‚āĻ–ā§āϝāĻž āϕ⧋āύāϟāĻŋ?

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. āϚāĻŋāĻ¤ā§āϰ⧇ āϛ⧋āϟ āĻāĻŦāĻ‚ āĻŦ⧜ āĻŦ⧃āĻ¤ā§āϤ⧇āϰ āĻŦā§āϝāĻžāϏāĻžāĻ°ā§āϧ āϝāĻĨāĻžāĻ•ā§āϰāĻŽā§‡ ā§§ āĻāĻŦāĻ‚ ā§ŠāĨ¤ āϝāĻĻāĻŋ āϛ⧋āϟ āĻŦ⧃āĻ¤ā§āϤāϟāĻŋ āĻŦ⧜ āĻŦ⧃āĻ¤ā§āϤ⧇āϰ āϚāĻžāϰāĻĒāĻžāĻļ⧇ āĻŦāĻžāĻŽā§‡ āĻĨ⧇āϕ⧇ āĻĄāĻžāύ⧇ āϘ⧁āϰ⧇ āϝāĻžā§Ÿ, āϤāĻŦ⧇ āĻŦ⧜ āĻŦ⧃āĻ¤ā§āϤ⧇āϰ āĻĒāϰāĻŋāϧāĻŋāϰ āĻ•āϤāϟ⧁āϕ⧁ āĻ…āĻ‚āĻļ āĻāϟāĻŋ āĻ…āϤāĻŋāĻ•ā§āϰāĻŽ āĻ•āϰāĻŦ⧇?

%Focuse keyword%

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 āĻĒāϰ⧀āĻ•ā§āώāĻžāϰ āύāĻŽā§āĻŦāϰ āĻŽā§ā§ŸāĻžāϜ, āĻŦ⧃āĻˇā§āϟāĻŋ, āĻāĻŦāĻ‚ āĻŽā§āϰāϏāĻžāϞāĻŋāύāϕ⧇ āĻĻ⧇āĻ–āĻžāϞ⧋, āĻ•āĻŋāĻ¨ā§āϤ⧁ āĻ…āĻ¨ā§āϝ āϏāĻŦāĻžāχ āϤāĻžāĻĻ⧇āϰ āύāĻŋāĻœā§‡āϰ āύāĻŽā§āĻŦāϰ āϞ⧁āĻ•āĻŋā§Ÿā§‡ āϰāĻžāĻ–āϞāĨ¤ āĻŽā§ā§ŸāĻžāϜ āĻŽāύ⧇ āĻ•āϰāϞ⧋, “āĻ•āĻŽāĻĒāĻ•ā§āώ⧇ āφāĻŽāĻžāĻĻ⧇āϰ āĻŽāĻ§ā§āϝ⧇ āĻĻ⧁āχāϜāύ⧇āϰ āύāĻŽā§āĻŦāϰ āϏāĻŽāĻžāύāĨ¤” āĻŦ⧃āĻˇā§āϟāĻŋ āĻŽāύ⧇ āĻ•āϰāϞ⧋, “āφāĻŽāĻŋ āϏāĻŦāĻšā§‡ā§Ÿā§‡ āĻ•āĻŽ āύāĻŽā§āĻŦāϰ āĻĒāĻžāχāύāĻŋāĨ¤” āĻŽā§āϰāϏāĻžāϞāĻŋāύ āĻŽāύ⧇ āĻ•āϰāϞ⧋, “āφāĻŽāĻŋ āϏāĻŦāĻšā§‡ā§Ÿā§‡ āĻŦ⧇āĻļāĻŋ āύāĻŽā§āĻŦāϰ āĻĒāĻžāχāύāĻŋāĨ¤”

āĻ•. āϕ⧇ āϏāĻŦāĻšā§‡ā§Ÿā§‡ āĻŦ⧇āĻļāĻŋ āύāĻŽā§āĻŦāϰ āĻĒā§‡ā§Ÿā§‡āϛ⧇?
āĻ–. āϕ⧇ āϏāĻŦāĻšā§‡ā§Ÿā§‡ āĻ•āĻŽ āύāĻŽā§āĻŦāϰ āĻĒā§‡ā§Ÿā§‡āϛ⧇?

Farhan shows his test score to Muaz, Bristy and Mursalin, but everyone else keeps it hidden. Muaz thinks, “At least two of us get same scores” Bristy thinks, “I didn’t get the lowest score.” Mursalin thinks, “I didn’t get the highest score.”
a. Who got the highest marks? (6 marks)
b. Who got the lowest marks?

2. āĻ›ā§Ÿ āĻŦāĻ¨ā§āϧ⧁ āĻāĻ•āϏāĻžāĻĨ⧇ āĻĄāĻžāĻ°ā§āϟ āϛ⧁āĻā§œā§‡ āĻŽāĻžāϰāĻžāϰ āĻĒā§āϰāϤāĻŋāϝ⧋āĻ—āĻŋāϤāĻžā§Ÿ āĻ…āĻ‚āĻļ āĻ¨ā§‡ā§ŸāĨ¤ āĻĄāĻžāĻ°ā§āϟ āϖ⧇āϞāĻžā§Ÿ āĻāĻ•āϟāĻŋ āĻŦ⧃āĻ¤ā§āϤāĻžāĻ•āĻžāϰ āĻŦā§‹āĻ°ā§āĻĄā§‡ āϞāĻ•ā§āĻˇā§āϝāϭ⧇āĻĻ āĻ•āϰāϤ⧇ āĻšā§Ÿ āĻāĻŦāĻ‚ āϕ⧋āύ āĻ…āĻ‚āĻļ⧇ āĻĒāϰ⧇āϛ⧇ āϤāĻž āĻ…āύ⧁āϝāĻžā§Ÿā§€ āĻ¸ā§āϕ⧋āϰ āĻĒāĻžāĻ“ā§ŸāĻž āϝāĻžā§ŸāĨ¤ āĻŦā§‹āĻ°ā§āĻĄā§‡ ⧧⧍āϟāĻŋ āĻ…āĻ‚āĻļ āĻ°ā§Ÿā§‡āϛ⧇, āϝ⧇āĻ–āĻžāύ⧇ āĻŽāĻžāύ ā§§ āĻĨ⧇āϕ⧇ ⧧⧍ āĻĒāĻ°ā§āϝāĻ¨ā§āϤ āĻĒā§‚āĻ°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻžāĨ¤
āφāĻŽāĻžāĻĻ⧇āϰ āĻ›ā§Ÿ āĻŦāĻ¨ā§āϧ⧁āϰāĻž āĻĒā§āϰāĻ¤ā§āϝ⧇āϕ⧇ āĻĻ⧁āϟāĻŋ āĻ•āϰ⧇ āĻĄāĻžāĻ°ā§āϟ āύāĻŋāĻ•ā§āώ⧇āĻĒ āĻ•āϰ⧇, āĻāĻŦāĻ‚ āĻĒā§āϰāϤāĻŋāϟāĻŋ āĻĄāĻžāĻ°ā§āϟ āĻŦāĻŋāĻ­āĻŋāĻ¨ā§āύ āĻ…āĻ‚āĻļ⧇ āĻ—āĻŋā§Ÿā§‡ āĻĒā§œā§‡āĨ¤ āϤāĻžāĻĻ⧇āϰ āĻ¸ā§āϕ⧋āϰ:
– āϤāĻŋāĻšāĻžāĻŽ: ā§§ā§Ŧ āĻĒā§Ÿā§‡āĻ¨ā§āϟ
– āĻĻā§€āĻĒā§āϤ: ā§Ē āĻĒā§Ÿā§‡āĻ¨ā§āϟ
– āϏāĻžāĻŽāĻŋāωāϰ: ā§­ āĻĒā§Ÿā§‡āĻ¨ā§āϟ
– āϏāĻžāĻŦā§āĻŦāĻŋāϰ: ā§§ā§§ āĻĒā§Ÿā§‡āĻ¨ā§āϟ
– āφāĻļāϰāĻžāĻĢ⧁āϞ: ⧍⧧ āĻĒā§Ÿā§‡āĻ¨ā§āϟ

āĻ•. āĻŽāĻžāĻšā§€â€™āϰ āĻ¸ā§āϕ⧋āϰ āĻ•āϤ? (⧧⧍ āĻŽāĻžāĻ°ā§āĻ•āϏ)
āĻ–. ⧝ āĻĒā§Ÿā§‡āĻ¨ā§āĻŸā§‡āϰ āĻ…āĻ‚āĻļ⧇ āĻ•āĻžāϰ āĻĄāĻžāĻ°ā§āϟ āĻĒā§œā§‡āϛ⧇?

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 Mahi’s score?
b. Who hits the region worth 9 points?

3. āĻāĻ•āϟāĻŋ āϚāĻŋāĻ¤ā§āϰ⧇ ABCD āĻāĻ•āϟāĻŋ āĻ†ā§ŸāϤāĻ•ā§āώ⧇āĻ¤ā§āϰ āĻāĻŦāĻ‚ EFGH āĻāĻ•āϟāĻŋ āϏāĻžāĻŽāĻžāĻ¨ā§āϤāϰāĻŋāĻ•āĨ¤ DI āĻāĻŦāĻ‚ EF āĻĒāϰāĻ¸ā§āĻĒāϰ āϞāĻŽā§āĻŦ āĻāĻŦāĻ‚ BK āĻāĻŦāĻ‚ HG āĻĒāϰāĻ¸ā§āĻĒāϰ āϞāĻŽā§āĻŦāĨ¤ āϚāĻŋāĻ¤ā§āϰ⧇ āĻĻ⧇āĻ“ā§ŸāĻž āĻĒāϰāĻŋāĻŽāĻžāĻĒāϗ⧁āϞ⧋ āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻ•āϰ⧇ DI āĻāϰ āĻŽāĻžāύ āύāĻŋāĻ°ā§āϪ⧟ āĻ•āϰāĨ¤

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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 āĻāĻ•āϟāĻŋ āϧāύāĻžāĻ¤ā§āĻŽāĻ• āĻĒā§‚āĻ°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻž āϝāĻžāϤ⧇ ⧍ā§Ļ⧧⧝ + n! āĻāĻ•āϟāĻŋ āĻĒā§‚āĻ°ā§āĻŖāĻŦāĻ°ā§āĻ—āĨ¤ n āĻāϰ āϏāĻ•āϞ āϏāĻŽā§āĻ­āĻŦ āĻŽāĻžāύ āύāĻŋāĻ°ā§āϪ⧟ āĻ•āϰāĨ¤
āĻāĻ–āĻžāύ⧇, n! = n × (n−1) × (n−2) × … × ⧍ × ā§§āĨ¤ āωāĻĻāĻžāĻšāϰāĻŖāĻ¸ā§āĻŦāϰ⧁āĻĒ – ā§Ē! = ā§Ē × ā§Š ×⧍ × 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 × 1. For example, 4! = 4 × 3 ×2 × 1 = 24.

5. ⧍, ā§Š, ā§Ģ, ā§Ŧ, ā§­, ā§§ā§Ļ, ā§§ā§§, ⧧⧍, ā§§ā§Š, … āϝāĻĻāĻŋ āϏ⧇āχāϏāĻŦ āĻ¸ā§āĻŦāĻžāĻ­āĻžāĻŦāĻŋāĻ• āĻĒā§‚āĻ°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻžāϰ āϧāĻžāϰāĻž āĻšā§Ÿ, āϝāĻžāϰāĻž āĻĒā§‚āĻ°ā§āĻŖ āĻŦāĻ°ā§āĻ— āĻ…āĻĨāĻŦāĻž āĻĒā§‚āĻ°ā§āĻŖ āϘāύ āϏāĻ‚āĻ–ā§āϝāĻž āύ⧟, āϤāĻŦ⧇ ⧍ā§Ļ⧧⧝āϤāĻŽ āĻĒāĻĻ āϕ⧋āύāϟāĻŋ?

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. āϚāĻŋāĻ¤ā§āϰ⧇ ABCD āĻāĻ•āϟāĻŋ āĻŸā§āϰāĻžāĻĒāĻŋāϜāĻŋ⧟āĻžāĻŽ āϝāĻžāϤ⧇ AB || CDāĨ¤ P, Q, R, S āϝāĻĨāĻžāĻ•ā§āϰāĻŽā§‡ AB, BD, DC, CA āĻāϰ āĻŽāĻ§ā§āϝ āĻŦāĻŋāĻ¨ā§āĻĻ⧁āĨ¤ AC āĻāĻŦāĻ‚ BD O āĻŦāĻŋāĻ¨ā§āĻĻ⧁āϤ⧇ āϛ⧇āĻĻ āĻ•āϰ⧇āĨ¤ â–ŗAOB āĻāϰ āĻ•ā§āώ⧇āĻ¤ā§āϰāĻĢāϞ ⧍ā§Ļ⧧⧝ āĻāĻŦāĻ‚ â–ŗCOD āĻāϰ āĻ•ā§āώ⧇āĻ¤ā§āϰāĻĢāϞ ⧍ā§Ļ⧍ā§ĻāĨ¤ āϚāϤ⧁āĻ°ā§āϭ⧁āϜ PQRS āĻāϰ āĻ•ā§āώ⧇āĻ¤ā§āϰāĻĢāϞ āĻ•āϤ?

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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 â–ŗAOB = 2019 and area of â–ŗCOD = 2020 .What is the area of quadrilateral PQRS?

7. āĻĻāĻžāĻŦāĻžā§Ÿ āĻāĻ•āϟāĻŋ āύ⧌āĻ•āĻž āĻļ⧁āϧ⧁ āĻ“āĻĒāϰ-āύāĻŋāϚ āĻŦāĻž āĻĄāĻžāύ-āĻŦāĻžāĻŽā§‡ āϝ⧇āϤ⧇ āĻĒāĻžāϰ⧇, āϕ⧋āύāĻžāϕ⧁āύāĻŋ āύ⧟āĨ¤ āφāĻŽāϰāĻž āĻāĻ•āϟāĻŋ āĻĻāĻžāĻŦāĻžāϰ āύ⧌āĻ•āĻžāϰ āϤāϞāĻžāϰ āĻ…āĻ‚āĻļāϟāĻŋ āϞāĻžāϞ āϰāĻ™ āĻ•āϰ⧇āĻ›āĻŋāĨ¤ āĻāĻ–āύ āϏ⧇ āϝāĻ–āύ āϕ⧋āύ āϚāĻžāϞ āĻĻā§‡ā§Ÿ, āϤāĻ–āύ āĻļ⧁āϰ⧁ āĻāĻŦāĻ‚ āĻļ⧇āώ āϘāϰ āĻ“ āϤāĻžāϰ āĻŽāĻžāĻāĻžāĻŽāĻžāĻāĻŋ āϏāĻŦ āϘāϰāϕ⧇ āϞāĻžāϞ āϰāĻ™ āĻ•āϰ⧇ āĻĢ⧇āϞ⧇āĨ¤ āĻĒā§āϰāĻŽāĻžāĻŖ āĻ•āϰ, āĻāĻ•āϟāĻŋ n × n āĻĻāĻžāĻŦāĻžāĻŦā§‹āĻ°ā§āĻĄā§‡āϰ āϏāĻŦāϗ⧁āϞ⧋ āϘāϰāϕ⧇ āϞāĻžāϞ āϰāĻ™ āĻ•āϰāϤ⧇ āĻāĻŽāύ āĻāĻ•āϟāĻŋ āύ⧌āĻ•āĻžāϰ āĻ•āĻŽāĻĒāĻ•ā§āώ⧇ 2n−1 āϚāĻžāϞ āĻĻāĻŋāϤ⧇ āĻšāĻŦ⧇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 × n chess board red.

8. M āĻāĻŦāĻ‚ N āĻĻ⧁āχāϟāĻŋ āϧāύāĻžāĻ¤ā§āĻŽāĻ• āĻĒā§‚āĻ°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻž āϝāĻžāϤ⧇ M āĻāĻŦāĻ‚ N āĻ…āϏāĻŽāĻžāύāĨ¤ M āĻāĻŦāĻ‚ N āĻāϰ āϞāϏāĻžāϗ⧁ āĻšāϞ⧋ \[M^2−N^2+MN \]āĨ¤ āĻĻ⧇āĻ–āĻžāĻ“ āϝ⧇ MN āĻāĻ•āϟāĻŋ āϘāύ āϏāĻ‚āĻ–ā§āϝāĻžāĨ¤

M and N are two positive integers where M is not equal to N . LCM of (M and N ) = \[M^2−N^2+MN \]. Show that MN is a perfect cubic number.

9. āĻ•āĻžāĻ°ā§āĻŸā§‡āĻ¸ā§€ā§Ÿ āĻ¸ā§āĻĨāĻžāύāĻžāĻ™ā§āĻ• āĻŦā§āϝāĻŦāĻ¸ā§āĻĨāĻžā§Ÿ āϚāĻžāϰāϟāĻŋ āĻŦāĻŋāĻ¨ā§āĻĻ⧁ (0, 0), (20, 0), (20, 19), āĻāĻŦāĻ‚ (0, 19) āĻĻāĻŋā§Ÿā§‡ āĻāĻ•āϟāĻŋ āĻ†ā§ŸāϤ āφāρāĻ•āĻž āĻšāϞ⧋āĨ¤ āĻļ⧁āϰ⧁āϤ⧇ (0, 0) āĻŦāĻŋāĻ¨ā§āĻĻ⧁āϤ⧇ āĻāĻ•āϟāĻŋ āĻŦāϞ (āĻŦāϞ⧇āϰ āφāĻ•āĻžāϰ āĻ…āĻ—ā§āϰāĻžāĻšā§āϝ) āφāϛ⧇āĨ¤ āĻŦāϞāϟāĻŋ (0, 0) āĻŦāĻŋāĻ¨ā§āĻĻ⧁ āĻĨ⧇āϕ⧇ (2, 1) āĻŦāĻŋāĻ¨ā§āĻĻ⧁āϰ āĻĻ⧁āϰ⧁āĻ¤ā§āĻŦ āϝāϤ āĻŦāϞāϟāĻŋ āĻĒā§āϰāϤāĻŋ āϏ⧇āϕ⧇āĻ¨ā§āĻĄ āϤāϤ āĻĻ⧁āϰ⧁āĻ¤ā§āĻŦ āĻ…āϤāĻŋāĻ•ā§āϰāĻŽ āĻ•āϰ⧇āĨ¤ āĻŦāϞāϟāĻŋ āĻ†ā§ŸāϤāĻ•ā§āώ⧇āĻ¤ā§āϰ⧇āϰ āĻŦāĻžāĻšā§āϤ⧇ āϧāĻžāĻ•ā§āĻ•āĻž āϖ⧇āϞ⧇ āĻĒā§āϰāϤāĻŋāĻĢāϞāύ⧇āϰ āϏ⧂āĻ¤ā§āϰāĻžāύ⧁āϝāĻžā§Ÿā§€ āĻĢāĻŋāϰ⧇ āϝāĻžā§ŸāĨ¤ āĻŦāϞāϟāĻŋ āĻ†ā§ŸāϤāĻ•ā§āώ⧇āĻ¤ā§āϰ⧇āϰ āϕ⧋āύāĻžā§Ÿ āϧāĻžāĻ•ā§āĻ•āĻž āϖ⧇āϞ⧇ āĻĒā§āϰāϤāĻŋāĻĢāϞāύ⧇āϰ āϏ⧂āĻ¤ā§āϰāĻžāύ⧁āϝāĻžā§Ÿā§€ āϝ⧇ āĻĻāĻŋāĻ• āĻĨ⧇āϕ⧇ āφāϏāĻ›āĻŋāϞ āϏ⧇āĻĻāĻŋāϕ⧇ āĻĢāĻŋāϰ⧇ āϝāĻžā§ŸāĨ¤ āĻāĻ­āĻžāĻŦ⧇ āĻŦāϞāϟāĻŋ āϏāĻŦāϏāĻŽā§Ÿ āĻ†ā§ŸāϤ⧇āϰ āĻŽāĻ§ā§āϝ⧇āχ āĻĨāĻžāϕ⧇āĨ¤ āĻŦāϞāϟāĻŋ āĻļ⧁āϰ⧁ āĻĨ⧇āϕ⧇ ⧍ā§Ļ⧧⧝ āϏ⧇āϕ⧇āĻ¨ā§āĻĄ āĻāϰ āφāĻ— āĻĒāĻ°ā§āϝāĻ¨ā§āϤ āĻ•āϤāĻŦāĻžāϰ āĻ†ā§ŸāϤ⧇āϰ āϕ⧋āύ⧋ āύāĻž āϕ⧋āύ⧋ āĻ•ā§ŒāύāĻŋāĻ• āĻŦāĻŋāĻ¨ā§āĻĻ⧁āϤ⧇ āϧāĻžāĻ•ā§āĻ•āĻž āĻ–āĻžāĻŦ⧇?

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. āϤāĻŋāύāϟāĻŋ āĻāĻ•āχ āϕ⧇āĻ¨ā§āĻĻā§āϰāĻŦāĻŋāĻļāĻŋāĻˇā§āϟ āĻŦ⧃āĻ¤ā§āϤ \[\omega_1, \omega_2, \omega_3\] āĻĻ⧇āĻ“ā§ŸāĻž āφāϛ⧇ āϝāĻžāĻĻ⧇āϰ āĻŦā§āϝāĻžāϏāĻžāĻ°ā§āϧ āϝāĻĨāĻžāĻ•ā§āϰāĻŽā§‡ \[r_1, r_2, r_3\] āĻāĻŦāĻ‚ \[r_1 + r_3 \geq 2r_2\]āĨ¤
āĻāĻŽāύ āĻāĻ•āϟāĻŋ āϰ⧇āĻ–āĻž āĻ…āĻ™ā§āĻ•āύ āĻ•āϰ āϝ⧇āϟāĻŋ \[\omega_1, \omega_2, \omega_3\]-āϕ⧇ āϝāĻĨāĻžāĻ•ā§āϰāĻŽā§‡ A, B, C āĻŦāĻŋāĻ¨ā§āĻĻ⧁āϤ⧇ āϛ⧇āĻĻ āĻ•āϰ⧇ āϝāĻžāϤ⧇ AB = BCāĨ¤

%Focuse keyword%

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.

BdMO 2019 – HigherSecondary

BdMO 2019 – Junior

BdMO 2019 – Primary

BdMO 2019 – Secondary

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