ISRO Scientist or Engineer Computer Science Dec 2017 Question 10

Question 10

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



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