If A = (5, -1, 1), B = (7, -4, 7), C = (1, -6, 10), D = (-1, -3, 4) then ABCD is a

JEE Advanced Mathematics question

If , , , then is a

Answer: (C)

, so is a parallelogram, with . Also , so . Adjacent sides are equal, so it is a rhombus.

Since $· =

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Question ID VK-109815