Question 416646
In a family with two children, what are the probabilities
of the following outcomes, assuming that the birth of
boys and girls is equally likely?
a. Both are boys. (1/2)(1/2) = 1/4
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b. The first is a girl and the second a boy. (1/2)(1/2) = 1/4
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c. Neither is a girl. (1/2)(1/2) = 1/4
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d. At least one is a girl. 
P(at least one) = 1 - P(none)
= 1 - (1/4)
= 3/4
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Cheers,
Stan H.
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