Asked by sam

How many three-letter code symbols can be formed using a set of 5 different letters if repetition is not allowed? To solve this I would only need to multiply 5x4x3 right? how would I solve it if repetition was allowed?
Answered by Reiny
it would be 5x5x5
Answered by sam
Could you please clarify? 5x5x5 would be used if repetition WAS allowed and 5x4x3 would be used if repetition is NOT allowed.... right?
Answered by Reiny
I answered you last question.

rep. allowed: 5x5x5
rep. not allowed : 5x4x3
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