How many 4-digit numbers can be made by using digits 1 to 5, if repetition is allowed?

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125

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625

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1024

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Solution

The correct option is C 625
First place can be acquired by any of the digits from 1 to 5. Similarly, Second, Third and Fourth place can be acquired by any of the digits from 1 to 5. Thus, The total number of 4-digit numbers $= 5^{4} = 625$

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