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Prove that 3^(2n)-1 is divisible by 8....

Prove that ` 3^(2n)-1` is divisible by 8.

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Hence , `3^(2k)-1` is divisible by 8 `AA n in N`
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FULL MARKS-COMBINATORICS AND MATHEMATICAL INDUCTION-ADDITIONAL QUESTIONS
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  13. Prove that 3^(2n)-1 is divisible by 8.

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