Prove that n3 + (n + 1)3 + (n + 2)3 is divisible by 9 for all

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Prove that n3 + (n + 1)3 + (n + 2)3 is divisible by 9 for all n ∈ N.
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Introduction to Real Analysis

ISBN: 978-0471433316

4th edition

Authors: Robert G. Bartle, Donald R. Sherbert

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