Use mathematical induction to prove the formula for all integers n2 1. 2+ 11 + 20 + 29 + … + (9n – 7) = (9n - 5). Find S, when n = 1. Assume that Sk = 2 + 11 + 20 + 29 + … + (9k – 7) = (9k – 5). ... Then, Sk +1 = Sk + ak + 1 = (2 + 11 + 20 + 29 + …* + (9k – 7)) + ak + 1º ak +1=

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