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n(n+1)(n+5) is a multiple of 3 Please give the answers of this question. I hAve seen the solutions but I am not able to understand the last k+1 part.

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n(n+1)(n+5) is a multiple of 3

Please give the answers of this question. I hAve seen the solutions but I am not able to understand the last k+1 part.



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