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Q.

A bag contains 3 red, 7 white and 4 black balls. If three balls are drawn from the bag, then the probability that all of them are of the same colour is:

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a

671

b

1091

c

781

d

None of these

answer is C.

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Detailed Solution

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Required probability =C3   3+C3   7+C3   4C3   14
=1+35+414.13.2=4014.26=1091

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