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UPSC NDA I 2018 Mathematics Solved Paper

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Question : 61

Total: 120

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=θ, then what is ∠PRQ equal to?

30°+θ
45°−θ
60°−θ
90°−θ

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