Question

The sum of the first term and the third term of a geometric series is 250
The sum of the second term and the third term of the series is 150
The common ratio of the series is r.
(a) Find the two possible values of r.
The sum of the first n terms of the series is Sn

Given that r > 0 and that

Sn> 399.99
(b) find the least value of n.

Answer 1

your ans

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