First off, are you sure it's 14 possibilities? I'm counting 16.

Second, to find the probability of having 2 girls & 2 boys, you divide the number of possibilities of having 2 girls & 2 boys by the total number of possibilities of having 4 children. So it's going to be

6/16 or 3/8

.375

37.5%

in fraction, decimal, and percentage form, respectively.

01