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#9 |
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In a two child family, one of the children is a boy - not known whether older or younger. What is the probability that both children are boys? The answer is not 50%. What is it and why?
------------------------------------------- one child is a boy. you dont know the age... could be unborn. which adds another possibility. the total possibilities are 2 boys 1 boy, 1 girl 1 girl, 1 boy chance is 1/3 not 1/2 |
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