Please help to prove this expression, so it is always divided with 7:

3^(2n+1) + 2^(n+2) = A(n) / 7

Please help to prove this expression, so it is always divided with 7:

3^(2n+1) + 2^(n+2) = A(n) / 7

3^(2n+1) + 2^(n+2) = A(n) / 7

- Martingale
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use the strong form of mathematical induction