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Assuming probability of having a boy is P(B) = 1/2, and of having a girl is P(G) = 1/2,
the probability of having 3 boys for 4 kids (with out regard to the girl to be the first,
second, third or fourth kid) is;
P(3B1G) = 4C3 [P(B)]4 = 4 (1/2)4 = 0.250 = 25%
The factor 4 comes because there are 4 possibilities for the order in which the girl can
come out.
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