1
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Question

Probability of birth of a girl or a boy child is equally likely. If a family has two children and it is known that the youngest child is a girl , then the probability that both the child born are girls is

A
14
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B
12
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C
13
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D
1
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Solution

The correct option is B 12If B represents boy and G represents girl then, Sample space will be {BB,GB,BG,GG} ∴ The required probability =12 Alternate solution one child is given as a girl child and P(G)=P(B)=12 ∴ The probability that the other child is also a girl is 12

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