Question 328029
You could look at the sample space of all possible combinations.
BBBBBB
BBBBBG
BBBBGB
BBBBGG
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GGGGBG
GGGGGG
There are 2^6=64 of them and then count the ones that have a G in it.
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OR
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At least one girl means not all boys.
P(all boys)+P(not all boys)=1
P(at least 1 girl)=1-P(all boys)
P(at least 1 girl)={{{1-1/64}}}
P(at least 1 girl)={{{63/64}}}