Question
If the vectors $2\hat{i} - 3\hat{j} + 4\hat{k}$, $2\hat{i} + \hat{j} - \hat{k}$, and $\lambda \hat{i} - \hat{j} + 2\hat{k}$ are coplanar, then the value of $\lambda$ is
If the vectors $2\hat{i} - 3\hat{j} + 4\hat{k}$, $2\hat{i} + \hat{j} - \hat{k}$, and $\lambda \hat{i} - \hat{j} + 2\hat{k}$ are coplanar, then the value of $\lambda$ is