SOLUTION: How many 4 number PIN numbers can be formed using the digits 0-9 if repetition is allowed? If repetition is NOT allowed?

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Question 312488: How many 4 number PIN numbers can be formed using the digits 0-9 if repetition is allowed? If repetition is NOT allowed?
Answer by Fombitz(32388)   (Show Source): You can put this solution on YOUR website!
With repetition,

Without repetition,

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