Q.The value of $\lambda$ so that the vectors $2\hat{i} - \hat{j} + \hat{k}$ , $\hat{i} + 2\hat{j} - 3\hat{k}$ and $\lambda \hat{i} + \lambda \hat{j} + 9\hat{k}$ are coplanar is

-3

-1

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Q.The value of λ\lambdaλ so that the vectors 2i^−j^+k^2\hat{i} - \hat{j} + \hat{k}2i^−j^​+k^, i^+2j^−3k^\hat{i} + 2\hat{j} - 3\hat{k}i^+2j^​−3k^ and λi^+λj^+9k^\lambda \hat{i} + \lambda \hat{j} + 9\hat{k}λi^+λj^​+9k^ are coplanar is