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Find the sum of the series `1+4/5+7/(5^2)+10/(5^3)+...`A. `7//16`B. `5//16`C. `105//64`D. `35//16` |
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Answer» Correct Answer - D Let ` S=1+4/5+7/5^(2)+10/5^(3)+..oo` Then `1/5S=1/5+4/5^(2)+7/5^(3)+..oo` or `S(1-1/5)=1+3[1/5+1/5^(2)+1/5^(3)+..oo]` or `4/5S=1+3xx(1//5)/(1-(1//5))=1+3/4=7/4` or `S=35/16` |
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