SOLUTION: How many four digit passwords are possible if repetition of digits is allowed?

SOLUTION: How many four digit passwords are possible if repetition of digits is allowed?

Algebra.Com

Question 689089: How many four digit passwords are possible if repetition of digits is allowed?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
How many four digit passwords are possible if repetition of digits is allowed?
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