Question 1165953
the sample space for number of girls in 4 children
1----4----6----4----1 from Pascal's triangle
denominator is 16 and the probability of 0 girls is 1/16, all the way over to 4 girls, where the probability is 1/16.

So if they have at least one girl, there are 15 possibilities for the other numbers
4 are just 1
6 are 2
4 are 3
1 is 4

so the answer is 1/15.