Let A = (1, 2, 3), B = (-1, -2, -1), C = (2, 3, 2) and D = (4, 7, 6). Then ABCD is a

JEE Advanced Mathematics question

Let , , and . Then is a

Answer: (C)

and . Since , is a parallelogram. (Equivalently, the diagonals and have the same midpoint \tfrac\tfrac$52,

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Question ID VK-109813