Suppose that John and Tom are sitting in a classroom containing 9 students in total. A teacher randomly divides these 9 students into two groups: Group I with 4 students, Group II with 5 students. (a) What is the probability that John is in Group I? (b) If John is in Group I, what is the probability that Tom is also in Group I? (c) What is the probability that John and Tom are in the same group?

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 Suppose that John and Tom are sitting in a classroom containing 9 students in total. A teacher
randomly divides these 9 students into two groups: Group I with 4 students, Group II with 5
students.
(a) What is the probability that John is in Group I?
(b) If John is in Group I, what is the probability that Tom is also in Group I?
(c) What is the probability that John and Tom are in the same group?

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