Use induction to prove that (f(n)=8^{n}-1) is divisible by 7 for all natural numbers (n). For the
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Use induction to prove that \(f(n)=8^{n}-1\) is divisible by 7 for all natural numbers \(n\). For the induction step, show that
\[
8^{k+1}-1=7 \cdot 8^{k}+\left(8^{k}-1ight)
\]
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