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How many number of 4 digits can be formed with the digits 1,2,3,4,5 if repetition of digit is allowed and not allowed?

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How many number of 4 digits can be formed with the digits 1,2,3,4,5 if repetition of digit is allowed and not allowed?
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1) Repetition is all allowed
4 digit number=5*5*5*=5^4=625
2) Repetition is not allowed
4 digit number=5*4*3*=120
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