Chapter 3.3 Combinations

2. a) P(10,4) = 5,040, b) C(10,4) = 210.

6. C(3,2)xC(2,1) = 6.

10. 1, 8, 28, 56, 70, 56, 28, 8, 1.

14. C(31,2) = 465.

18. C5,3) = 10.

22. a) C(13,5) = 1,287, b) C(13,2)xC(13,3) = 22,308.

26. 20!/[10!(2!)^10] = 654,729,075.

30. C(50,6)x2x2x2x2x2x2 = 1,017,004,800.

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