SOLUTION: In a family, if the probability of having a boy or girl is equal;and there are three children, what is the probability of having at least a girl?

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Question 1028539: In a family, if the probability of having a boy or girl is equal;and there are three children, what is the probability of having at least a girl?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Find the probability of all boys and then use the complement.
P%28BBB%29=%281%2F2%29%281%2F2%29%281%2F2%29
P%28BBB%29=1%2F8
So,
P=1-P%28BBB%29
P=1-1%2F8
P=7%2F8