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The sum of 'n' terms of series (1-1/n)+(...

The sum of 'n' terms of series `(1-1/n)+(1-2/n)+(1-3/n)+...` will be-

A

`1/n(n+1)`

B

`1/n(n-1)`

C

`1/2(n+1)`

D

`1/2(n-1)`

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