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If a function f(x) is given by f(x)=x/(1...

If a function `f(x)` is given by `f(x)=x/(1+x)+x/((x+1)(2x+1))+x/((2x+1)(3x+1))+...oo` then at `x=0,f(x)`

A

has no limit

B

is not continuous

C

is continuous but not differentiable

D

is differentiable

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