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17 March, 00:53

A couple has 2 children. what is the probability that both are girls if the older of the two is a girl?

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  1. 17 March, 04:22
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    Assuming that the probability of boys and girls is equal (in reality slightly more boys than girls are born), the probability is 1/2, simply because the older girl's gender is given and therefore not a part of the probability.

    This question comes from the 'boy or girl paradox', a. k. a. the Mrs Smith Problem.
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