Question
The value of λ for which the 2 vectors 2i – j + 2k
and 3i + λ j + k are perpendicular isÂSolution
Dot product of two mutually perpendicular vectors is zero. ⇒ 2 x 3 + (-1)λ + 2 x 1 = 0 ⇒  λ = 8Â
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