Question 3

Prove that the vectors $\mathbf{i} - 2\mathbf{j} + 3\mathbf{k}$, $-2\mathbf{i} + 3\mathbf{j} - 4\mathbf{k}$ and $\mathbf{i} - 3\mathbf{j} + 5\mathbf{k}$ are coplanar.