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f'(x) = x^(2) - 5x + 4 then f(x) is decr...

`f'(x) = x^(2) - 5x + 4` then f(x) is decreasing in

A

`(-oo,0)`

B

`(1,4)`

C

`(4, oo)`

D

everywhere

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The correct Answer is:
B
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