consider Strongs of eight uppercase English letters how many

consider Strongs of eight uppercase English letters.

how many strings of eight uppercase English letter are there if no letter can be repeated?

Since there are 26 letters in the English Alphabet, to form an 8 letter string

The first letter has 26 choices

Since 1 letter has exhausted

The second letter has 25 choices and so on

So the number of strings are 26.25.24.23.22.21.20.19=P(26,8)