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For what value of n, the n^ (th) terms ...

For what value of `n`, the `n^ (th) ` terms of the series `" 5+10+20+......`and ` 1280+640` `+320+. . `are equal

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V PUBLICATION-SEQUENCES AND SERIES-QUESTIONBANK
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  20. For what value of n, the n^ (th) terms of the series " 5+10+20+.........

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