If a family has 4 children, what is the probability that they have 2 boys and 2 girls? Assuming that the probability of getting a boy or a girl is the same.
Here are the possibilities
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111 16 possibilities 6 have 2 of each 6/16 = 37.5 % ...as Guest posted!