# Find Snfor each of the geometric series described below.(i) a = 3, t8 = 384, n = 8. (ii) a = 5, r = 3, n = 12.Ans. 765

(i) t8 = 384

ar8–1 = 384

(3)r7 = 384

r7 = 128

r = 2

Sum of n terms =

Sum of 8 terms =

Sum of 8 terms = 3(255) = 765

(ii) Sum of n terms =

Sum of 12 terms =

Sum of 12 terms =

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