### Home > A2C > Chapter Ch10 > 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 * _{n}*P

_{6}: choose and arrange 6 items from a collection of

*n*items.

*n*(*n* − 1)(*n* − 2)(*n* − 3)(*n* − 4)(*n* − 5)