Q.The value of $\lambda$ so that the vectors $\vec{a} = \hat{i} - \lambda \hat{j} + 2\hat{k}$ , $\vec{b} = 2\hat{i} + \hat{j} - \hat{k}$ are perpendicular is

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Q.The value of λ\lambdaλ so that the vectors a⃗=i^−λj^+2k^\vec{a} = \hat{i} - \lambda \hat{j} + 2\hat{k}a=i^−λj^​+2k^, b⃗=2i^+j^−k^\vec{b} = 2\hat{i} + \hat{j} - \hat{k}b=2i^+j^​−k^ are perpendicular is