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1. Prove that 21 divides 3n7 + 7n3 + 11n for all integers n. 2. Prove...

1. Prove that 21 divides 3n7 + 7n3 + 11n for all integers n.
2. Prove that n91 ≡ n7 (mod 91) for all integers n. Is n91 ≡ n (mod 91) for all integers n ?

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