A friend of yours has two children. You know that at least one of his children is a boy. What is the probability that both children are boys? (You believe thatthe chance of having a boy is the same as...

A friend of yours has two children. You know that at least one of his children is a boy. What is the probability that both children are boys? (You believe thatthe chance of having a boy is the same as the chance of having a girl regardless ofthe number and gender of any previous children).

a. 1/4

b. 1/3

c. 1/2

d. None of the above.