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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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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.
User Soroush Rabiei
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