defence exam Agniveer Army Technical Mock Test Series 2025 Mathematics Vector Algebra Properties of Vectors
What is the value of λ for which the vectors \(\rm 2\hat i - 5\hat j - \hat k\) and \(\rm -\hat i + 4 \hat j + \lambda\hat k\) are perpendicular?
1
21
2
-18
3
-22
4
22