A couple decides to have 2 children. If they succeed in having 2 children and each child is equally likely to be a boy or a girl, What is the probability that they will have exactly 1 girl and 1 boy?  Choose the correct option
A) 1/2
B) 3/4
C) 1
D) 2
E) 3
Sample space = 2^2 = 4.   Favourable events = {bg}, {gb},   Probability = 2/4 = 1/2.   1/2ns (1/2).
<result>A</result>
A couple decides to have 2 children. If they succeed in having 2 children and each child is equally likely to be a boy or a girl, What is the probability that they will have exactly 1 girl and 1 boy?