### Home > A2C > Chapter 10 > Lesson 10.2.3 > Problem 10-94

10-94.

Here is another way to think about the question: “

*What is 0!*?” Homework Help ✎How many ways are there to choose all five items from a group of five items? What happens when you substitute into the factorial formula to compute

_{5}*C*_{5}? Since you know (logically) what the result has to be, use this to explain what 0! must be equal to.On the other hand, how many ways are there to choose

*nothing*from a group of five items? And what happens when you try to use the factorial formula to compute_{5}*C*_{0}?

See part (a).