4. For each integer n with n > 2, let P(n) be the formula n-1 n(n – 1)(n + 1) Eii + 1) = iml a. Write P(2). Is P(2) true? b. Write P(k). c. Write P(k + 1). d. In a proof by mathematical induction that the formula holds for all integers n > 2, what must be shown in the inductive step?

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