Two adjacent sides of a parallelogram are 2 i -4 j +5 k and i -2 j -3 k . What is the magnitude of dot product of vectors which represent its diagonals?

NDA 2020 Mathematics question

Two adjacent sides of a parallelogram are and . What is the magnitude of dot product of vectors which represent its diagonals?

Answer: (C)

The diagonals are and , and \vec\vec$

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Question ID VK-029239