ABC is a triangle right-angled at B. If A(k, 1, -1), B(2k, 0, 2) and C(2+2k, k, 1) are the vertices of the triangle, then what is the value of k?

NDA 2025 Mathematics question

is a triangle right-angled at . If , and are the vertices of the triangle, then what is the value of ?

Answer: (D)

and .

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Question ID VK-030074