How do you find out the value of the common ratio if a=1 and the sum to...

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Nadine

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...infinity of the series is 5? Q- A geometric series has the first term 1 and common ratio r. Given that the sum to infinity of the series is 5, find the value of r.

And also, what would be the least value of n of which the sum of the first n terms of the series exceeds 4.9.

Thanks
 
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