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if f(x) be a twice differentiable funct...

if f(x) be a twice differentiable function such that `f(x) =x^(2) " for " x=1,2,3,` then

A

`f''(x)=2 " "AA x in [1,3]`

B

`f''(x) =2 " ""for some " x in (1,3)`

C

`f''(x) =2 " " AA x in (1,3)`

D

`f'(x) =2x " " AA x in (1,3)`

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The correct Answer is:
B
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