1.

(1)/(2)((1)/(5)+(1)/(7))-(1)/(4)((1)/(5^(2))+(1)/(7^(2)))+(1)/(6)((1)/(5^(3))+(1)/(7^(3)))-….oo=

Answer»

`(1)/(2)log_(E )(5//7)`
`(1)/(2)log_(e )(47//35)`
`log_(e )(47//35)`
`log_(e )(35//47)`

Answer :B


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