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A woman has two kids. One is a boy. What are the odds the other is a boy?

Poll: What are the odds?
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100%
1.15%
 1 1.15%
50%
79.31%
 69 79.31%
33%
16.09%
 14 16.09%
25%
3.45%
 3 3.45%
Total 87 vote(s) 100%
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A woman has two kids. One is a boy. What are the odds the other is a boy?
Mark
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#3
2009-03-12, 12:10 PM
Or so you think.

Consider the four possibilities for having two children:

B/B
B/G
G/B
G/G

We can eliminate G/G because we know that one of them is a boy. This leaves B/B, B/G and G/B. Only 1 in 3 has the other as a boy also.
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A woman has two kids. One is a boy. What are the odds the other is a boy? - by Mark - 2009-03-12, 12:10 PM

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