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If `f : R to R `is given `f (x) = x +1,` then the value of `lim _( b - oo) (1)/(n) [ f (0) + f ((5)/(n)) + f ((10)/(n)) +...+ f ((5 ( n -1))/( n )) ],` is :

A

`1/2`

B

`3/2`

C

`7/2`

D

`5/3`

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