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The expression $3^{2n+1} + 2^{n+2}$ is divisible by $7$ for

1. all positive integer values of $n$
2. all non-negative integer values of $n$
3. only even integer values of $n$
4. only odd integer values of $n$

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+1 vote

Option (A) is the correct answer.

by Boss (13.7k points)

+1 vote