Posted by Nicole on Monday, January 10, 2011 at 3:22pm.
a) So it could be
GBB or BGB or BBG
prob of that is 3(1/2)(1/2)(1/2) = 3/8
b) at most 2 boys ---> cannot have BBB
which has a prob of 1/8
so your case has prob of 1 - 1/8 = 7/8
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