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An arithmetic series is of the form . a+ad+ a+2d + a+2d +..(a+ n-1 d) Sum of AP: S n = n 2 2 a+ n-1 d or S n = n 2 a+l . where a . and. l . are the first and last terms. A geometric progression is of the form . a+ar+a r 2 +a r 3 + ar 4 + ar 5 +⋯+ ar n-1 The sum of the first n terms of a geometric progression is given by the formula. S n = a(1 ... ................
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