A young couple has three children. The probability that all three children are boys, if it is known that atleast one of the children is a boy is

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120

answer is B.

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Detailed Solution

S={BBB,BBG,BGB,BGG,GBB,GBG,GGB,GGG}A={BBB}B={BBB,BBG,BGB,BGG,GBB,GBG,GGB}P(A/B)=17

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