Q:

If vectors \vec{a}=2\hat{i}+\lambda \hat{j}+\hat{k } and \vec{b}=\hat{i}-2 \hat{j}+3\hat{k } are perpendicular to each other, then value of λ is

(A) 2/5
(B) 2
(C) 3
(D) 5/2

ISRO

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