JEE Main · 2023 · 06 Apr 2023 · Shift 1 · Vector Algebra

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Let and . If is a vector perpendicular to both and and , Then is equal to
  1. (A)640
  2. (B)760
  3. (C)680
  4. (D)720✓ Correct

Answer: (D)

Solution

Since is perpendicular to both and , it is parallel to . Write . From with , , so and . Then , so .

JEE Main · 2023 · 06 Apr 2023 · Shift 1 · Single correct option

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