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Home > A2C > Chapter 10 > Lesson 10.2.3 > Problem 10-91

10-91.

Begin with 12, (12−1) ... and write out four factors.

Write them in the same way you wrote the factors for part (a).

Remember the meaning of nP6: choose and arrange 6 items from a collection of n items.

n(n − 1)(n − 2)(n − 3)(n − 4)(n − 5)