math
posted by Jazmine .
Assuming boy and girl babies are equally likely, find the probability that a family with three children will have exactly 1 boy

prob= C(3,1) (1/2)(1/2)^2
= 3/8
or just list them
BBB
BBG
BGB
GBB
GGB .....
GBG .....
BGG ....
GGG
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