consider two groups are students, where the first group has 7 women and 3 men and the second group has 5 women and 5 men. Agroup is selected randomly and then students in the selected group are randomly arranged. Suppose the probability of choosing group 1 is p.
(a) what is the probability that the first two are men
(b) Given the first two are men, what is the probability that group 2 was selected.