SOLUTION: How many 3-letter passords can be made using the letters A thought Z if... a) Repetition of letters is allowed? b) Repetition of letters is not allowed?

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Question 1195700: How many 3-letter passords can be made using the letters A thought Z if...
a) Repetition of letters is allowed?
b) Repetition of letters is not allowed?
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.

(a)  26%5E3 = 17576.



(b)  26*25*24 = 15600.

Solved.