College Algebra & Trigonometry, 2018a

314 CHAPTER 7. COMBINATORICS
EXERCISES 7.2
1) 4 ∗ 5! 2) 3! ∗ 4! 3) 5! ∗ 3!
4)
8!
6!
5)
10!
7!
6)
9! ∗ 6!
3! ∗ 7!
7)
12! ∗ 3!
8! ∗ 6!
8) 10P 4 9) 4P 3
10) 7P 5 11) 9P 2 12) 8P 4
13) 50P 3 14) nP 4 15) 10P r
16) List all the permutations of the letters {a, b, c}.
17) List all the permutations of the letters {a, b, c} taken two at a time.
18) How many permutations are there of the group of letters {a, b, c, d, e}?
19) How many permutations are there of the group of letters {a, b, c, d}?
List these permutations.