A geometric series has a common ratio, $\displaystyle r=\frac{b-a}{b}$ , b>0.

If 0<a<2b, show that the geometric series has a sum to infinity.

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- Jan 24th 2008, 02:59 AMSengNeeSum to infinity
A geometric series has a common ratio, $\displaystyle r=\frac{b-a}{b}$ , b>0.

If 0<a<2b, show that the geometric series has a sum to infinity. - Jan 24th 2008, 03:17 AMmr fantastic