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Set of values of 'a' for which the funct...

Set of values of 'a' for which the function `f : R to R,` given by `f (x) =x ^(3) +(a+2)x^(2)+3ax+10` is one-one is given by :

A

`(-oo, 1] uu[4,oo)`

B

`[1,4]`

C

`[1,oo]`

D

`[-oo,4]`

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The correct Answer is:
B
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