What is the P(k+1) statement used in the proof by mathematical induction of the formula: Σ= ( +1) = = Ο n(n-1)(n+1), Vn ≥ 2 3 Σ+1(1+1) (k+1)k(k+2) 3 kk + = = k+1) = (k+1)k(k+2) 3 (k+ 1) (k+2) Σ(i+1) = - (k+1)k(k+2) 3 (k+1)k(k+2) 3

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