SOLUTION: How many 5 letters codes can be made if no letters can be used twice?

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Question 448453: How many 5 letters codes can be made if no letters can be used twice?
Found 2 solutions by ewatrrr, Alan3354:
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

How many 5  letters codes can be made if no letters can be used twice?

If there are 5 letters used only, then 5! or  5*4*3*2 = 120



If all 26 letters of the alphabet may be used for the code, then:

  26*25*24*23*22

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
If you mean letters of the alphabet, and not case sensitive, it's
26*25*24*23*22
= 7893600