11TH•Mathematics•Vectors In Space•Question 4

(i)

Find the constant $\alpha$ such that the vectors are coplanar.

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$\mathbf{i} - \mathbf{j} + \mathbf{k}$ , $\mathbf{i} - 2\mathbf{j} - 3\mathbf{k}$ and $3\mathbf{i} - \alpha\mathbf{j} + 5\mathbf{k}$

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