One lady has 2 children, one of her child is boy, what is the probability of having both are boys Choices.
A) 1 / 2	B) 1 / 3	C) 1 / 4	D) 1 / 5	E) 3 / 4

Rationale: n ( s ) = one of her child is boy out of 2 children = bb , bg = 2 n ( e ) = both are boys = bb = 1 so p = n ( e ) / n ( s ) = 1 / 2 answer : a
Answer: A