Question 375979
For {{{3}}} children, there are {{{2^3}}} possible outcomes.
GGG
GGB
GBG
GBB
BGG
BGB
BBG
BBB
Of those, the outcomes with 1 G are {{{3}}}.
{{{P(1 G)=3/8}}}
Getting at most two girls means not {{{3}}} girls.
P(3 G)={{{1/8}}}
P(not 3 G)+P(3G)={{{1}}}
P(not 3 G)=P(at most 2G)={{{1-1/8=7/8}}}