A couple decides to have 3 children. If they succeed in having 3 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 2 boys?
Options:  A) 3 / 4  B) 1 / 2  C) 5 / 8  D) 1  E) 1 / 4

Rationale: sample space = 2 ^ 3 = 8 favourable events = { bgg } , { bgb } , { bbb } , { ggg } , { gbg } , probability = 5 / 8 = 5 / 8 . ans ( c ) .
Answer: C