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Question

If (α,α2) lies inside the triangle formed by the lines 2x+3y1=0,x+2y3=0,5x6y1=0, then

A
2α+3α21>0
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B
α+2α23>0
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C
α+2α23<0
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D
6α25α+1>0
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Solution

The correct options are
A 2α+3α21>0
B α+2α23<0
D 6α25α+1>0
we want (α,α2) to be above 2x+3y1=0
2α+3α21>0
(α,α2) to be above 5x6y1=0
5α6α21<0 6α25α+1>0
(α,α2) to be below x+2y3=0
α+2α23<0

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