A bag contains 2 red, 3 white and 5 blac...

A bag contains 2 red, 3 white and 5 black balls, a ball is drawn its colour is noted and replaced. If the probability of getting a red ball for the first time at the `n^("th")` trial is atleast `(2)/(25)`, then the greatest value of n is equal to

A

4

B

5

C

6

D

7

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The correct Answer is:

B

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