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(C) To find the last digit of $5^n$ for any positive integer $n$,let us observe the powers of $5$:$5^1 = 5$$5^2 = 25$$5^3 = 125$$5^4 = 625$In each cas

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$5$

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(C) To find the last digit of $5^n$ for any positive integer $n$,let us observe the powers of $5$:$5^1 = 5$$5^2 = 25$$5^3 = 125$$5^4 = 625$In each case,the last digit (units digit) is $5$.Therefore,for any positive integer $n$,the last digit of $5^n$ is always $5$.

For any positive integer $n$,the last digit of $5^n$ is always.......

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