The sum of the first two terms of a geometric progression is 9 and the sum to infinity is 25. If the common ratio is positive, find the common ratio and the first term.
Since r>0,r>0,r>0, we take r=45.r=\dfrac{4}{5}.r=54.
a=5,r=45a=5, r=\dfrac{4}{5}a=5,r=54
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