The coordinates of the vertices P, Q and R of a triangle PQR are (1, -1, 1), (3, -2, 2) and (0, 2, 6) respectively. If RQP= , then what is PRQ equal to?

NDA 2018 Mathematics question

The coordinates of the vertices P, Q and R of a triangle PQR are , and respectively. If , then what is equal to?

Answer: (D)

and , with $·

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Question ID VK-028872