Help with a proof by induction – math.stackexchange.com

Help with a proof by induction – math.stackexchange.com

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I want to prove that $2^{n+2} +3^{2n+1}$ is divisible by 7 for all $n \in N$ using proof by induction. Attempt Prove true for n = 1 $2^{1+2} + 3^{2(1) +1} = 35$ 35 is divisible by 7 so true for n ...

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