Find the number of different selections of 5 letters, which can be made from
`5A's,4B's,3C's,2D's and 1E`

Explanation

To find the number of different selections of 5 letters from the given letters: 5 A's, 4 B's, 3 C's, 2 D's, and 1 E, we can use the concept of generating functions or directly apply the combinatorial method.

### Step-by-step Solution:

1. **Understanding the Problem**:
We need to select a total of 5 letters from the available letters with their respective counts. The letters available are:
- A: 5
- B: 4
...