Let and . If is a vector perpendicular to both and and , Then is equal to
- (A)640
- (B)760
- (C)680
- (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