Let the vectors and . For some , let . If and , then is equal to :
- (A)8
- (B)12✓ Correct
- (C)14
- (D)15
Answer: (B)
Solution
Writing . The condition gives , and gives . Adding the two, , so and then . Hence , and .
JEE Main · 2026 · 02 Apr 2026 · Shift 2 · Single correct option