(ii) a=4i−2j+3k\mathbf{a} = 4\mathbf{i} - 2\mathbf{j} + 3\mathbf{k}a=4i−2j+3k, b=i+j+k\mathbf{b} = \mathbf{i} + \mathbf{j} + \mathbf{k}b=i+j+k