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Question

Find sum of the series 34,112,3,.... upto 8 terms.

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Solution

Clearly the given series is G.P with common ratio =2 and a=34
Sn be sum of first n terms of G.P. and r be common ratio
Formula for sum of n terms of G .P is given by
Sn=a(rn1)r1

S8=34×(281)21=7654

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