Chapter 2, Problem 49E

The purpose of Exercises 49 and 50 is for you to learn how to numerically manipulate factorials. If you use a calculator to answer these questions, you are defeating the purpose of the exercise. Please try Exercises 49 and 50 without using a calculator.

a. Given that $10!=3,628,800$, find $9!$

b. find $\frac{11!}{10!}$

c. find $\frac{11!}{9!}$

d. find $\frac{9!}{6!}$

e. find $\frac{11!}{99!}$