The position vectors of vertices A, B and C of triangle ABC are respectively j + k , 3 i + j +5 k and 3 j +3 k . What is angle C equal to?

NDA 2022 Mathematics question

The position vectors of vertices , and of triangle are respectively , and . What is angle equal to?

Answer: (D)

and $ = (3, 1, 5)-(0, 3, 3) =

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Question ID VK-029481