4th January 2006, 11:10 PM
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Member
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Join Date: Jan 1970
Posts: 4,367
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Quote:
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Originally Posted by woof43
You are also told that one of those two children is a girl
There are four possible ways in which a family can have two children:
#1 Girl-Girl (probability = .25)
#2 Girl-Boy (prob = .25)
#3 Boy-Girl (prob = .25)
#4 Boy-Boy (prob = .25)
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What is the difference between Girl-boy and Boy-Girl, they are the same thing.
Boy-boy is an invalid combination given the question.
There are two possible combinations
Girl Girl
Girl Boy
That's it. |