# A clerk has 4 different letters that need to go in 4 different envelopes. What is the probability that all 4 letters are placed in the correct envelopes?

##### 1 Answer

Jun 13, 2017

The probability that all

#### Explanation:

Let us first question how many ways are there in which we can place

The answer is

But there is **only one way** of pacing letters in correct envelopes, of course assuming that addressees areall different.There are

Hence, the probability that all