Question: Q4 (5 marks) Let n 2 1. Give a combinatorial proof of the identity n3 = (n - 1)3 + 3(n - 1)2 + 3(n

Q4 (5 marks) Let n 2 1. Give a combinatorial proof of the identity n3 = (n - 1)3 + 3(n - 1)2 + 3(n - 1) + 1. Q5 (5 marks) n+3 K Let n 2 1. Give a combinatorial proof of the identity E n + 4 k=4

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