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(b) By using mathematical induction, show that 1 . 2 . 3+ 2 . 3 . 4 + ... + n(n + 1)(n + 2)

(b) By using mathematical induction, show that 1 . 2 . 3+ 2 . 3 . 4 + ... + n(n + 1)(n + 2) = - n(n + 1)(n + 2)(n + 3) 4 for all positive integers n. (10 marks)

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