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Question

The point which does not lie in the half plane 3xy9 is

(a) (3,2) (b) (1,3)
(c) (3,1) (d) (2,3)

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Solution

Only point (3,1) does not satisfies the condition 3xy9 i.e., 3×31×(1)=10>9.
Therefore, answer is (c) (3,1)

Let's check for other points.

For (3,2),3×3(2)=9+2=7<9

so, this point will satisfy the given condition 3xy9

For (1,3),3×13=0<9

(1,3) will satisfy the given condition 3xy9

For point (2,3),3×23=3<9

Point (2,3) will also satisfy the given condition 3xy9


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