SOLUTION: How many different ways can 9 letters be grouped without any letter being repeated?

Question 212781: How many different ways can 9 letters be grouped without any letter being repeated?
Answer by vleith(2983) (Show Source): You can put this solution on YOUR website!
Assuming english alphabet and lower case and upper case count as one, then you have 26 letters.
So how many ways can you use 9 different letters?
First letter can be anyone of the 26.
The second one can't duplicate the first, so there are 25 you could choose
then 24, 23, 22, 21 ...

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