BD Math Olympiad 2020 Selection Questions for Primary & Junior Levels

 

Primary preliminary questions

1. 10 āĻŦāĻ›āϰ āĻŦ⧟āϏ⧇ āϜ⧁āύāĻžā§Ÿā§‡āĻĻ⧇āϰ āωāĻšā§āϚāϤāĻž āĻ›āĻŋāϞ 50 āϏ⧇āĻŽāĻŋ āĻāĻŦāĻ‚ 20 āĻŦāĻ›āϰ āĻŦ⧟āϏ⧇ āϜ⧁āύāĻžā§Ÿā§‡āĻĻ⧇āϰ āωāĻšā§āϚāϤāĻž āĻšā§Ÿā§‡āϛ⧇ 63 āϏ⧇āĻŽāĻŋāĨ¤ 10 āĻŦāĻ›āϰ⧇ āϜ⧁āύāĻžā§Ÿā§‡āĻĻ⧇āϰ āωāĻšā§āϚāϤāĻž āĻ•āϤāϟ⧁āϕ⧁ āĻŦā§‡ā§œā§‡āϛ⧇?
When Junayed was 10 years old, he was 50 inches tall. When he was 20 years old, Junayed was 63 inches tall. By how many inches did Junayed’s height increase in those 10 years?

2. āϚāĻŋāĻ¤ā§āϰ⧇ 1 āĻĨ⧇āϕ⧇ āĻļ⧁āϰ⧁ āĻ•āϰ⧇ āĻ•ā§āϰāĻŽāĻŋāĻ• āϏāĻ‚āĻ–ā§āϝāĻž āϗ⧁āϞ⧋ āĻāĻ•āϟāĻŋ āĻ¤ā§āϰāĻŋāϭ⧁āϜāĻžāĻ•āĻžāϰ āĻŸā§‡āĻŦāĻŋāϞ⧇ āĻĻ⧇āĻ–āĻž āĻšā§Ÿā§‡āϛ⧇āĨ¤ āĻĒā§āϰāϤāĻŋāϟāĻŋ āϏāĻžāϰāĻŋāϤ⧇ āφāϗ⧇āϰ āϏāĻžāϰāĻŋāϰ āĻšā§‡ā§Ÿā§‡ āĻāĻ•āϟāĻŋ āϏāĻ‚āĻ–ā§āϝāĻž āĻŦ⧇āĻļāĻŋ āĻ°ā§Ÿā§‡āϛ⧇āĨ¤ 1 āϏāĻžāϰāĻŋāϤ⧇ 11 āϏāĻ‚āĻ–ā§āϝāĻž āĻ°ā§Ÿā§‡āϛ⧇ āĻāĻŦāĻ‚ āϏāĻžāϰāĻŋāϰ āϏāĻ‚āĻ–ā§āϝāĻžāϗ⧁āϞ⧋āϰ āϝ⧋āĻ—āĻĢāϞ āĻ•āϤ?
The consecutive counting numbers are written in a triangular table, as shown, with one more number in each successive row. What is the sum of the numbers in the row that contains 11?

3. āĻĻ⧁āϟāĻŋ āϏāĻŽā§āĻĒā§‚āĻ°ā§āĻŖ āϕ⧋āϪ⧇āϰ āϏāĻŽāĻˇā§āϟāĻŋ āĻĻ⧁āϟāĻŋ āĻĒā§‚āĻ°ā§āĻŖ āϕ⧋āϪ⧇āϰ āϏāĻŽāĻˇā§āϟāĻŋ āĻĨ⧇āϕ⧇ āĻ•āϤ āĻĄāĻŋāĻ—ā§āϰāĻŋ āĻŦ⧇āĻļāĻŋ?
What is the difference between the sums of two supplementary angles and two complementary angles?

4. āĻāĻ•āϟāĻŋ āĻŦā§āϝāĻžāĻ•āĻŸā§‡āϰāĻŋ⧟āĻž āĻĒā§āϰāϤāĻŋ āϏ⧇āϕ⧇āĻ¨ā§āĻĄā§‡ āύāĻŋāĻœā§‡āϰ 3 āϟāĻŋ āĻ•āĻĒāĻŋ āϤ⧈āϰāĻŋ āĻ•āϰ⧇āĨ¤ āĻāĻ­āĻžāĻŦ⧇ āĻŦā§āϝāĻžāĻ•āĻŸā§‡āϰāĻŋ⧟āĻž āĻĒā§āϰāϤāĻŋ āϏ⧇āϕ⧇āĻ¨ā§āĻĄā§‡ āύāĻŋāĻœā§‡āϰ āύāϤ⧁āύ āĻ•āĻĒāĻŋ āϤ⧈āϰāĻŋ āĻ•āϰāϤ⧇ āĻĨāĻžāϕ⧇āĨ¤ āĻāĻ•āϟāĻŋ āĻŦāĻžāϰ⧇ āĻāĻ•āϟāĻŋ āĻŦā§āϝāĻžāĻ•āĻŸā§‡āϰāĻŋ⧟āĻž āϰ⧇āϖ⧇ āĻĻ⧇āĻ“ā§ŸāĻž āĻšāϞ⧇ 1 āϏ⧇āϕ⧇āĻ¨ā§āĻĄ āĻĒāϰ⧇ āĻŦāĻžāĻ•ā§āϝ⧇ āĻŽā§‹āϟ 4 āϟāĻŋ āĻŦā§āϝāĻžāĻ•āĻŸā§‡āϰāĻŋ⧟āĻž āĻšāĻŦ⧇āĨ¤ 5 āϏ⧇āϕ⧇āĻ¨ā§āĻĄ āĻĒāϰ⧇ āĻŦāĻžāĻ•ā§āϝ⧇ āĻ•āϤāϟāĻŋ āĻŦā§āϝāĻžāĻ•āĻŸā§‡āϰāĻŋ⧟āĻž āĻĨāĻžāĻ•āĻŦ⧇?

A bacterium can make 3 copies of itself every second. If you place a bacterium inside a box, after a second, there will be 4 bacteria in the box. After 5 seconds, how many bacteria will be there in the box?

5. 1010-āϕ⧇ āĻ•āϤ āϏāĻ‚āĻ–ā§āϝāĻžāϝāĻŧ āĻ¸ā§āĻŦāĻžāĻ­āĻžāĻŦāĻŋāĻ• āϏāĻ‚āĻ–ā§āϝāĻž āĻĻā§āĻŦāĻžāϰāĻž āĻ­āĻžāĻ— āĻ•āϰāĻž āϝāĻžā§Ÿ, āϝāĻžāϤ⧇ āĻ­āĻžāĻ—āĻļ⧇āώ āĻļā§‚āĻ¨ā§āϝ āĻšā§Ÿ?

How many numbers are there by which 1010 is divisible without any remainders?

6. abc āĻāĻ•āϟāĻŋ āϤāĻŋāύ āĻ…āĻ‚āϕ⧇āϰ āϏāĻ‚āĻ–ā§āϝāĻž āĻāĻŦāĻ‚ a – c = 2āĨ¤ abc – cba -āĻāϰ āĻŽāĻžāύ āĻ•āϤ? [c > 0]

abc is a three-digit number and a − c = 2. What is the value of abc − cba? [c > 0]

7. āĻāĻ•āϟāĻŋ ā§Š āĻŽāĻŋāϟāĻžāϰ āĻŦā§āϝāĻžāϏāĻžāĻ°ā§āϧ⧇āϰ āĻŦ⧃āĻ¤ā§āϤ⧇āϰ āĻĒāϰāĻŋāϧāĻŋāϕ⧇ āϏāϰāϞāϰ⧇āĻ–āĻž āĻŦāĻžāύāĻžāύ⧋ āĻšāϞ⧋āĨ¤ āĻĒā§āϰāϤāĻŋāĻŦāĻžāϰ āϏ⧇āχ āϰ⧇āĻ–āĻž āĻŦāϰāĻžāĻŦāϰ āĻĸ⧇āωāϗ⧁āϞ⧋ āĻļ⧁āϰ⧁ āĻ•āϰāϞ⧇ ā§Š āĻŽāĻŋāϟāĻžāϰ āĻĒā§āϰāϤāĻŋ āϏ⧇āϕ⧇āĻ¨ā§āĻĄā§‡ āϏāĻŽāĻžāύāĻ­āĻžāĻŦ⧇ āϚāϞ⧇āĨ¤ āĻŦ⧃āĻ¤ā§āϤ⧇āϰ āĻāĻ• āĻĒā§āϰāĻžāĻ¨ā§āϤ āĻĨ⧇āϕ⧇ āĻ…āĻ¨ā§āϝ āĻĒā§āϰāĻžāĻ¨ā§āϤ⧇ āϝ⧇āϤ⧇ āϤāĻžāϰ āĻĒā§āĻ°ā§Ÿā§‹āϜāύ⧀āϝāĻŧ āϏāĻŽāϝāĻŧ āĻ•āϤ āϏ⧇āϕ⧇āĻ¨ā§āĻĄ?

The circumference of a circle with a radius of 3 meters is turned into a straight line. Prottoy starts running along the line at a uniform velocity of 3Ī€ meters per second. How long (in seconds) would it take him to go from one end of the straight line to the other?

8.ABC āĻāĻ•āϟāĻŋ āϏāĻŽāϕ⧋āĻŖā§€ āĻ¤ā§āϰāĻŋāϭ⧁āϜ, āϝ⧇āĻ–āĻžāύ⧇ A āϕ⧋āĻŖāϟāĻŋ āϏāĻŽāϕ⧋āĻŖāĨ¤ D, BC-āĻāϰ āωāĻĒāϰ āĻāĻŽāύ āĻāĻ•āϟāĻŋ āĻŦāĻŋāĻ¨ā§āĻĻ⧁ āϝ⧇āύ DA = DCāĨ¤ D-āĻāϰ āĻŽāĻžāĻ§ā§āϝāĻŽā§‡ āĻ…āĻ™ā§āĻ•āĻŋāϤ AB āĻāϰ āϏāĻŽāĻžāĻ¨ā§āϤāϰāĻžāϞ āϰ⧇āĻ–āĻžāϟāĻŋ AC-āϕ⧇ E āĻŦāĻŋāĻ¨ā§āĻĻ⧁āϤ⧇ āϛ⧇āĻĻ āĻ•āϰ⧇āĨ¤ āϝāĻĻāĻŋ AB = 6 āĻšā§Ÿ, āϤāĻžāĻšāϞ⧇ DE āĻāϰ āĻĻ⧈āĻ°ā§āĻ˜ā§āϝ āĻ•āϤ?

ABC is a right-angled triangle, where, the angle A is a right-angle. D is a point on BC such that, DA=DC. The line through D parallel to AB intersects AC at E. If AB=6, what is the length of DE?

9. āĻāĻ•āϟāĻŋ āĻ—āĻžāϛ⧇ ā§Ēā§ĻāϟāĻŋ āĻĢāϞ āφāϛ⧇, ⧍ā§ĻāϟāĻŋ āφāĻĒ⧇āϞ āĻāĻŦāĻ‚ ⧍ā§ĻāϟāĻŋ āĻ…āĻ¨ā§āϝ āĻĢāϞāĨ¤ āϝāĻĻāĻŋ āĻŦāĻ¨ā§āϧ āĻ•āϰ⧇ āϰāĻžāĻ–āĻž āĻā§ā§œāĻŋ āĻĨ⧇āϕ⧇ āĻāĻ•āϟāĻŋ āĻĢāϞ āϤ⧋āϞāĻž āĻšā§Ÿ, āύāĻŋāσāϏāĻ¨ā§āĻĻ⧇āĻšā§‡ āϏ⧇āĻ–āĻžāύ āĻĨ⧇āϕ⧇ āĻāĻ•āϟāĻŋ āφāĻĒ⧇āϞ āϤ⧋āϞāĻžāϰ āϏāĻŽā§āĻ­āĻžāĻŦāύāĻž āĻ•āϤ?
There are 40 oranges, 20 apples, and 20 lemons in a bag. What is the minimum number of fruits that you have to take out of the bag with your eyes closed before you are sure that one of them is an orange?

10. āĻĸāĻžāĻ•āĻž āĻĨ⧇āϕ⧇ āϏāĻŋāϞ⧇āĻŸā§‡ āĻŦāĻžāϏ/āĻŸā§āϰ⧇āύ/āĻĒā§āϰ⧇āĻŽ āϝāĻžāĻ“āϝāĻŧāĻž āϝāĻžāϝāĻŧāĨ¤ āϏāĻŋāϞ⧇āϟ āĻĨ⧇āϕ⧇ āϏ⧁āύāĻžāĻŽāĻ—āĻžā§āĻœā§‡ āĻŦāĻžāϏ⧇/āĻĒā§āϰ⧇āĻŽā§‡ āϝāĻžāĻ“āϝāĻŧāĻž āϝāĻžāϝāĻŧāĨ¤ āĻĸāĻžāĻ•āĻž → āϏāĻŋāϞ⧇āϟ → āϏ⧁āύāĻžāĻŽāĻ—āĻžā§āϜ → āϏāĻŋāϞ⧇āϟ → āĻĸāĻžāĻ•āĻžāĨ¤ āĻāχ āϝāĻžāĻ¤ā§āϰāĻžāϝāĻŧ āĻŽā§‹āϟ āĻ–āϰāϚ āφāϏāĻž-āϝāĻžāĻ“āϝāĻŧāĻž āĻ•āϤ āĻšāĻŦ⧇?

To go to Sylhet from Dhaka, there are three choices of vehicles (bus/train/plane). To go to Sunamganj from Sylhet, there are two choices of vehicles (bus/train). How many ways can you traverse the following route: Dhaka->Sylhet->Sunamganj->Sylhet->Dhaka?

Junior preliminary questions

1. ā§Š āĻĻāĻŋāϝāĻŧ⧇ āĻŦāĻŋāĻ­āĻžāĻœā§āϝ āĻĒā§āϰāĻĨāĻŽ ā§§ā§Ļā§ĻāϟāĻŋ āĻ¸ā§āĻŦāĻžāĻ­āĻžāĻŦāĻŋāĻ• āϏāĻ‚āĻ–ā§āϝāĻžāϰ āϏāĻŽāĻˇā§āϟāĻŋ āĻ•āϤ?

What is the summation of the first 100 numbers that are divisble by 3 without any remainders?

2. āύāĻŋāĻšā§‡āϰ āϏāĻ‚āĻ–ā§āϝāĻžāϗ⧁āϞ⧋āϰ āĻŽāĻ§ā§āϝ⧇ āϝ⧇āϗ⧁āϞ⧋ āĻŽā§ŒāϞāĻŋāĻ• āϏāĻ‚āĻ–ā§āϝāĻž, āϤāĻžāĻĻ⧇āϰ āϏāĻŽāĻˇā§āϟāĻŋ āĻ•āϤ? āϏāĻ‚āĻ–ā§āϝāĻžāϗ⧁āϞ⧋: 2, 3, 6, 7, 9, 10

Find the summation of the prime numbers from the following list: 2, 3, 6, 7, 9, 10

3. ABC āĻāĻ•āϟāĻŋ āϏāĻŽāϕ⧋āĻŖā§€ āĻ¤ā§āϰāĻŋāϭ⧁āϜ, āϝ⧇āĻ–āĻžāύ⧇ A āϕ⧋āĻŖāϟāĻŋ āϏāĻŽāϕ⧋āĻŖāĨ¤ D,BC-āĻāϰ āωāĻĒāϰ āĻāĻŽāύ āĻāĻ•āϟāĻŋ āĻŦāĻŋāĻ¨ā§āĻĻ⧁ āϝ⧇āύ DA = DCāĨ¤ D-āĻāϰ āĻŽāĻžāĻ§ā§āϝāĻŽā§‡ āĻ…āĻ™ā§āĻ•āĻŋāϤ AB -āĻāϰ āϏāĻŽāĻžāĻ¨ā§āϤāϰāĻžāϞ āϰ⧇āĻ–āĻžāϟāĻŋ AC-āϕ⧇ E āĻŦāĻŋāĻ¨ā§āĻĻ⧁āϤ⧇ āϛ⧇āĻĻ āĻ•āϰ⧇āĨ¤ āϝāĻĻāĻŋ AB = 6 āĻšā§Ÿ, āϤāĻžāĻšāϞ⧇ DE āĻāϰ āĻĻ⧈āĻ°ā§āĻ˜ā§āϝ āĻ•āϤ?

ABC is a right-angled triangle, where, the angle A is a right-angle. D is a point on BC such that, DA=DC. The line through D parallel to AB intersects AC at E. If AB=6, what is the length of DE?

4. abc āĻāĻ•āϟāĻŋ āϤāĻŋāύ āĻ…āĻ™ā§āϕ⧇āϰ āϏāĻ‚āĻ–ā§āϝāĻž āĻāĻŦāĻ‚ a – c = 21āĨ¤ abc – cba āĻāϰ āĻŽāĻžāύ āĻ•āϤ? [c > 0]

abc is a three digit number and a − c = 2. What is the value of abc − cba? [c > 0]

5. āĻāĻ•āϟāĻŋ āĻŦāĻ¸ā§āϤ⧁āϰ āωāĻĒāϰ āĻĒā§āϰāĻ­āĻžāĻŦāĻŋāϤ āĻŦāϞ āϞāĻžāϞ, āϏāĻŦ⧁āϜ, āύ⧀āϞ, āĻšāϞ⧁āĻĻ āϚāĻžāϰāϟāĻŋ āĻŦāϞ⧇āϰ āĻŽāĻžāĻ§ā§āϝāĻŽā§‡ āωāĻĒāĻ¸ā§āĻĨāĻžāĻĒāĻŋāϤāĨ¤ āϤāĻžāĻĻ⧇āϰ āϝ⧌āĻĨ āĻĒā§āϰāĻ­āĻžāĻŦ⧇ āĻŦāĻ¸ā§āϤ⧁āϟāĻŋ āϚāϞāϤ⧇ āĻļ⧁āϰ⧁ āĻ•āϰ⧇āĨ¤ āϕ⧋āύ āĻŦāϞāϟāĻŋ āĻ…āĻ¨ā§āϝ āĻŦāϞ⧇āϰ āϝ⧌āĻĨ āĻĒā§āϰāĻ­āĻžāĻŦ⧇āϰ āĻāĻ•āĻ• āĻŦāϞ⧇āϰ āĻŽāĻ§ā§āϝ⧇ āĻ…āĻ¨ā§āϤāĻ°ā§āϭ⧁āĻ•ā§āϤ āĻĨāĻžāĻ•āĻŦ⧇?

In a box, there are red, green, blue, yellow and black marbles. There are 200 marbles of each color. At least how many marbles do you have to pick from the box to guarantee that you have picked 100 marbles of the same color?

6. āĻĸāĻžāĻ•āĻž āĻĨ⧇āϕ⧇ āϏāĻŋāϞ⧇āĻŸā§‡ āĻŦāĻžāϏ⧇/āĻŸā§āϰ⧇āύ⧇/āĻĒā§āϰ⧇āĻŽā§‡ āϝāĻžāĻ“āϝāĻŧāĻž āϝāĻžāϝāĻŧāĨ¤ āϏāĻŋāϞ⧇āϟ āĻĨ⧇āϕ⧇ āϏ⧁āύāĻžāĻŽāĻ—āĻžā§āĻœā§‡ āĻŦāĻžāϏ⧇/āĻŸā§āϰ⧇āύ⧇ āϝāĻžāĻ“āϝāĻŧāĻž āϝāĻžāϝāĻŧāĨ¤ āĻĸāĻžāĻ•āĻž → āϏāĻŋāϞ⧇āϟ → āϏ⧁āύāĻžāĻŽāĻ—āĻžā§āϜ → āϏāĻŋāϞ⧇āϟ → āĻĸāĻžāĻ•āĻžāĨ¤ āĻāχ āϝāĻžāĻ¤ā§āϰāĻžāϝāĻŧ āĻŽā§‹āϟ āĻ–āϰāϚ āφāϏāĻž-āϝāĻžāĻ“āϝāĻŧāĻž āĻ•āϤ āĻšāϤ⧇ āĻĒāĻžāϰ⧇?

To go to Sylhet from Dhaka, there are three choices of vehicles (bus/train/plane). To go to Sunamganj from Sylhet, there are two choices of vehiches (bus/train). How many ways can you traverse the following route: Dhaka->Sylhet->Sunamganj->Sylhet->Dhaka?

7. āĻāĻ•āϟāĻŋ āϏāĻŽāϤāϞ⧇ ā§ŦāϟāĻŋ āĻŦāĻŋāĻ¨ā§āĻĻ⧁ āϏāϰāϞāϰ⧇āĻ–āĻžāϝāĻŧ āĻ…āĻŦāĻ¸ā§āĻĨāĻŋāϤ āύāĻž āĻšāϞ⧇ āϤāĻžāĻĻ⧇āϰ āϝ⧋āĻ—āϏāĻ‚āĻ–ā§āϝāĻž āĻ•āϤ āĻšāϤ⧇ āĻĒāĻžāϰ⧇? āϏāĻŦāĻšā§‡āϝāĻŧ⧇ āĻŦāĻĄāĻŧ āĻ¤ā§āϰāĻŋāϭ⧁āϜ āĻ­āĻžāϗ⧇ āĻŦāĻŋāĻ­āĻ•ā§āϤ āĻ•āϰāĻž āϏāĻŽā§āĻ­āĻŦ?

In a plane, 6 distinct lines intersect the interior of a square forming regions within the square. What is the maximum number of regions that can be formed?

8. 51b2cd āĻāĻ•āϟāĻŋ āĻ›āϝāĻŧ āĻ…āĻ™ā§āϕ⧇āϰ āĻĒā§‚āĻ°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻž āϝāĻžÂ  5  āĻāĻŦāĻ‚Â  11  āĻĻā§āĻŦāĻžāϰāĻž āĻŦāĻŋāĻ­āĻžāĻœā§āϝāĨ¤ āϏāĻ‚āĻ–ā§āϝāĻžāϟāĻŋāϰ āϏāĻŽā§āĻ­āĻžāĻŦā§āϝ āĻŽāĻžāύ⧇āϰ āϝ⧋āĻ—āĻĢāϞ āĻ•āϤ?

51b2cd is a six-digit perfect square that is divisible by both 5 and 11. What is the sum of all possible values of it?

9. āĻ¤ā§āϰāĻŋāϭ⧁āϜāĻžāĻ•āĻžāϰ ABCD-āĻāϰ AB āĻāĻŦāĻ‚ CD āĻĒāϰāĻ¸ā§āĻĒāϰ āϏāĻŽāĻžāĻ¨ā§āϤāϰāĻžāϞ āϰ⧇āĻ–āĻžāĨ¤ P, Q āϝāĻĨāĻžāĻ•ā§āϰāĻŽā§‡ AC āĻāĻŦāĻ‚ BD āϰ⧇āĻ–āĻžāϰ āĻŽāĻ§ā§āϝāĻŦāĻŋāĻ¨ā§āĻĻ⧁āĨ¤ āϝāĻĻāĻŋ CD = 2020 āĻāĻŦāĻ‚ AB = 1010, āϤāĻŦ⧇ PQ-āĻāϰ āĻĻ⧈āĻ°ā§āĻ˜ā§āϝ āĻ•āϤ? Bd math Olympiad 2020 selection questions

Let AB and CD be the parallel sides of trapezium ABCD.Let P and Q be the midpoint of the diagonals AC and BD.If CD=2020 and AB=1010 then what is the length of PQ?

10. āϚāĻŋāĻ¤ā§āϰ⧇ āϝ⧇āϏāĻŦ āĻŦ⧃āĻ¤ā§āϤ āĻĻ⧇āĻ–āĻž āϝāĻžāĻšā§āϛ⧇, āϤāĻžāĻĻ⧇āϰ āĻŽāĻ§ā§āϝ⧇ āĻ•ā§āώ⧁āĻĻā§āϰāϤāĻŽ āĻŦ⧃āĻ¤ā§āϤ⧇āϰ āĻŦā§āϝāĻžāϏāĻžāĻ°ā§āϧ 1 āĻāĻ•āĻ•āĨ¤ āĻāϰ āĻĒāϰ⧇ āĻĒā§āϰāϤāĻŋāϟāĻŋ āĻŦ⧃āĻ¤ā§āϤ⧇āϰ āĻŦā§āϝāĻžāϏāĻžāĻ°ā§āϧ āĻĒāĻ°ā§āϝāĻžāϝāĻŧāĻ•ā§āϰāĻŽā§‡ 1 āĻāĻ•āĻ• āĻ•āϰ⧇ āĻŦ⧃āĻĻā§āϧāĻŋ āĻĒ⧇āϝāĻŧ⧇āϛ⧇āĨ¤ āϏāĻžāĻĻāĻž āĻāĻŦāĻ‚ āĻ•āĻžāϞ⧋ āĻ…āĻ‚āĻļ⧇āϰ āĻ•ā§āώ⧇āĻ¤ā§āϰāĻĢāϞ⧇āϰ āĻĒāĻžāĻ°ā§āĻĨāĻ•ā§āϝ āϝāĻĻāĻŋ  \pi x^2 āĻŦāĻ°ā§āĻ— āĻāĻ•āĻ• āĻšāϝāĻŧ, āϤāĻŦ⧇ x-āĻāϰ āĻŽāĻžāύ āĻ•āϤ?%Focuse keyword%

The smallest circle in the following figure has a radius of 1 unit. The circles larger than it has a successive increase of 1 unit in their radii. If the difference of the white and black colored area is  \pi x^2 , what is the value of x?

 

BdMO-2020-All-Problem-Set

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