How many ways can you spell the word Ace?

There are 10 ways to spell the word "Ace" using the letters A, C, and E:

1. Ace

2. Aec

3. Cae

4. Cae

5. Cea

6. Eac

7. Eca

8. Eac

9. Eca

10. Eac

Notice that some combinations are repeated, this is because we can rearrange the letters in different ways to spell the word.