After being dropped, a certain ball always bounces back to 2/5 of the height of its previous bounce. After the first bounce it reaches a height of 125 inches. How high (in inches) will it reach after its fourth bounce ?

After being dropped, a certain ball always bounces back to 2/5 of the height of its previous bounce. After the first bounce it reaches a height of 125 inches. How high (in inches) will it reach after its fourth bounce ?

A 20

B 8

C 5

D 3.2

Solution

Correct Answer: Option B

solution: ১২৫ এর ২/৫ \( \times \) ২/৫ \( \times \) ২/৫ = ৮

(৪ বার বলায় প্রথমবারের ১২৫ বাদে ৩ বার ২/৫ )