(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Prove 9^{n}-1 is divisible by 8 such that n is positive integer.

2. Relevant equations

3. The attempt at a solution

It looks simple and i tried to apply everything i know but yet i can't prove it. Any hints?

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# Homework Help: Prove that it is divisible by 8.

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