Six friends went for a picnic. They wanted to take some group photos with all six friends in two rows of 3 each. How many different arrangements are possible if a different arrangement of friends within rows is considered a different arrangement.
2. A faculty committee has decided to choose one or more students to join the committee. A total of 5 juniors and 6 seniors have volunteered to serve on this committee. How many different choices are there if the committee decides to select
(a) three students with the condition that at least one junior and at least one senior is included?
(b) Exactly one student?
