If $n$ is a positive integer, then what is the digit in the unit place of $3^{2 n + 1} + 2^{2 n + 1}$ ?

0

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3

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5

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7

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Solution

The correct option is C $5$
Let us put $n = 1$ in equation $3^{2 n + 1} + 2^{2 n + 1}$
Therefore, $3^{3} + 2^{3} = 27 + 8 = 35$
Therefore, digit in the unit place is $5$ .

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