The first term of a geometric progression is 350. If the ...
The first term of a geometric progression is 350. If the sum to infinity is 250, find the common ratio.
−57
−25
25
57
Correct answer is B
S∞=a1−r (Sum to infinity of a GP)
250=3501−r⟹250(1−r)=350
350=250−250r⟹350−250=−250r
250r=−100⟹r=−100250=−25
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