1.

निम्नांकित श्रेणी का योगफल ज्ञात कीजिए। `(1)/(5)+(1)/(7)+(1)/(5^(2))+(1)/(7^(2))+.........." to "oo`

Answer» Correct Answer - `(5)/(12)`
अभीष्ट योगफल `=((1)/(5)+(1)/(5^(2))+(1)/(5^(3))+......." to "oo)+((1)/(7)+(1)/(7^(2))+(1)/(7^(3))+..........+" to "oo)]`


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