engineering recuitment AAI ATC Junior Executive 2025 Mock Test Series Mathematics Three Dimensional Geometry Angle with Planes
The two planes 2x - y + 3z + 5 = 0 and x + 4y + λz + 4 = 0 are perpendicular, then the value of the λ is
1
1
2
\(2\over3\)
3
-1
4
\(1\over2\)