25. Check whether 12" can end with the digit 'O' for any natural number n.
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By prime factorization method,
12=2x2x3
Therefore, 12^n can not end with the digit '0' because the prime factorization of 12 does not contain the prime 5.
If the number 12^n, for any natural number n, were to end with the digit '0', then it would be divisible by 5.
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