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JEE MATHEMATICS MCQ: PERMUTATIONS

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If n=2p−1(2p−1)n=2^{p-1}\left(2^p-1\right), where 2p−12^p-1 is a prime, then the sum of the divisors of nn is equal to
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Correct option: B
2n2 \mathrm{n}
Option B is correct because the sum of divisors of n, where n is in the given form, is equal to 2n.

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