1.

Let a(n) =1-(1)/(2)+(1)/(3)+…+(-1)^(n-1)(1)/(n)," then "(1)/(n+1)+(1)/(n+2)+…+(1)/(2n) is equal to

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`a (2N)`
`a(2n)-a(N)`
`a(3N)-a(2n)`
NONE of these

Answer :A


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