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If a family has two children who are not twins, what is the probability that both are boys? (Assume single boy or girl births are equally likely.)

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Question:

A
\(\frac{\mathrm{1} }{\mathrm{4}}\)

explanation

Multiply the probability that the first child is a boy and the probability that the second child is a boy to obtain \(\frac{\mathrm{1} }{\mathrm{2}} \times \frac{\mathrm{1} }{\mathrm{2}} = \frac{\mathrm{1} }{\mathrm{4}}\)

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