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If A=1+r^a+r^(2a)+ to ooa n dB=1+r^b+r^(...

If `A=1+r^a+r^(2a)+` to `ooa n dB=1+r^b+r^(2b)+oo` , prove that `r=((A-1)/A)^(1//a)=((B-1)/B)^(1//a)`

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The correct Answer is:
`((B-1)/B)^(1//b)`
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