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The set of values 'x' for which f(x)=x^(...

The set of values 'x' for which `f(x)=x^(3)+6x^(2)+27x+10` is increasisng in

A

(1,2)

B

`(-oo,1)U(2,oo)`

C

`(-oo,oo)`

D

`(-oo,1)`

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The correct Answer is:
C
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