a

a

Find the value of: (i) $2\mathbf{i} \times 2\mathbf{j} \cdot \mathbf{k}$ (ii) $3\mathbf{j} \cdot (\mathbf{k} \times \mathbf{i})$ (iii) $[\mathbf{k}\,\mathbf{i}\,\mathbf{j}]$ (iv) $[\mathbf{i}\,\mathbf{i}\,\mathbf{k}]$