Question 509177
A couple plans to have two children. Assume that on any given birth, having a boy and having a girl are equally likely.
Possibilities: bb,bg,gb,gg
--------------------------------------- 
(a) What is the probability that exactly one of the children is a girl?
Ans: 2/4
-------------- 
(b) What is the probability that at least one of the children is a girl? 
Ans: 3/4
==============
Cheers,
Stan H.
==============