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Q.

A bag contains 4 red, 3 black and 2 white balls. If 3 balls are selected at random, the probability of selecting atleast one white ball is

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a

712

b

512

c

13

d

14

answer is A.

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Detailed Solution

A bag contains 4 red, 3 black and 2 white balls.

3 balls are selected at random

nS= 9C3=84

E=Event of  selecting 3balls which contain atleast one white ball

E=event of not selecting a white ball

nE= 7C3=35

PE=1-PE=1-3584=1-512=712

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A bag contains 4 red, 3 black and 2 white balls. If 3 balls are selected at random, the probability of selecting atleast one white ball is