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A bag contains 20 balls out of which x a...

A bag contains 20 balls out of which x are white. If 10 more white balls are put in the bag, the probability of drawing a white ball now will be double that of drawing one white ball at random before putting 10 white balls in bag. Find x.

A

20

B

5

C

10

D

15

Text Solution

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The correct Answer is:
B
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