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A bag contains w white and b black balls...

A bag contains w white and b black balls. A ball is drawn at random and put back in the bag with k additional balls of the same colour. A ball is again drawn at random from the bag. The probability that it is black is

A

(b+k)/(w+b+k)

B

b/(w+b+k)

C

b/(w+b)

D

b/(w+b+2k)

Text Solution

Verified by Experts

The correct Answer is:
C
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