What is the area of the triangle with vertices (x_1, 1 x_1 ), (x_2, 1 x_2 ), (x_3, 1 x_3 )?

NDA 2018 Mathematics question

What is the area of the triangle with vertices , , ?

Answer: (D)

Area . Multiplying the rows by : the determinant equals

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Question ID VK-028992