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If the function f(x) =2x^2-kx+5 is incre...

If the function `f(x) =2x^2-kx+5` is increasing on [1,2] then k lies in the interval

A

`(-oo,4)`

B

`(4,oo)`

C

`(-oo,8)`

D

`(8,oo)`

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The correct Answer is:
A
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