total number of cases is C(9,2) Total Number of ways = choosing 2 from 9 =C(9,2). out of 3 people, 2 people can be chosen in C(3,2) ways, and we can have 3 teams of 3 people, and hence 3 * C(3,2) is the total number of ways in which 2 people can be in the same team. So, Prob = (Favorable Number of C...