Q.The value of $\lambda$ for which the vector $3\hat{i} - 6\hat{j} + \hat{k}$ and $\lambda \hat{i} + 4\hat{j} + \hat{k}$ are parallel is

-1

3/2

-3/2

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Q.The value of λ\lambdaλ for which the vector 3i^−6j^+k^3\hat{i} - 6\hat{j} + \hat{k}3i^−6j^​+k^ and λi^+4j^+k^\lambda \hat{i} + 4\hat{j} + \hat{k}λi^+4j^​+k^ are parallel is