If Swamy has two children and he truthfully answers yes to the question “Is at least one of your children a girl?”, what is the probability that both his children are girls?
A
13
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B
12
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C
23
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D
1
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Solution
The correct option is B12 We know for sure that one of the children is a girl because Swamy is not lying. That leaves us with two possibilities:- (Girl,Boy) and (Girl,Girl) ∴ Total cases = 2 Favourable cases = 1, i.e. (Girl,Girl) ∴ Required probability =12