alleryThe sum of n terms of a G.P. with first term a, common ratio r (r≠1), is:
Aa/(1−r)
Ba(r^n−1)/r
Ca + nr
Da(1−r^n)/(1−r)
Answer & Solution
Correct answer: D. a(1−r^n)/(1−r)
S_n = a(1−r^n)/(1−r) for r≠1.
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