Question 677114

Solution: 

The probability of a boy or a girl being born is {{{0.5}}}. The probability of {{{2}}} boys and {{{1}}} girl being born is  (0.5)^2(0.5)^1 =(0.5)^3 and the number of ways this can happen is C(2,1). 

Therefore the probability of exactly {{{2}}} boys and {{{1}}} girl being born is C(2,1)(0.5)^3
. 
C(2,1)(0.5)^3

since {{{(0.5)^3=(1/2)^3=(1/2^3)=1/8=0.125}}} or {{{12.5}}}%