What is the probability for a family with four children to have two boys and two girls (assuming the probability of having a boy or a girl is equal)?  Choose the correct option:
A) 1/2
B) 1/4
C) 1/8
D) 3/8
E) 5/16
One possible case is: girl - girl - boy - boy   The probability of this is 1/2*1/2*1/2*1/2 = 1/16   There are 4C2 = 6 such cases so we should multiply by 6.   P(two boys and two girls) = 6/16 = 3/8   The answer is 3/8.
<result>D</result>
What is the probability for a family with four children to have two boys and two girls (assuming the probability of having a boy or a girl is equal)?