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Question

Function f(x)=x33x29x+22 is monotonic decreasing for

A
1<x<3
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B
1<x<3
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C
3<x<1
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D
None of these
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Solution

The correct option is A 1<x<3
f(x)=x33x29x+22
Given f is monotonic decreasing, so f(x)<0
f(x)=3x26x9<0
x22x3<0
1<x<3

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