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Step-by-step explanation:
Area of triangle = 1/2 {X1 ( y2-y3) + X2 (y3-y1) + X3 ( y1-y2) }
= 1/2 {1 (3-4) + 2 (3-4). + 3(2-3) }
= 1/2 { - 1. - 2 - 3 }
= 1/2 { -6}
= - 3 unit
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