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If $\mathbf{a}=\mathbf{i}-2 \mathbf{j}$ and $\mathbf{b}=2 \mathbf{i}+\lambda \mathbf{j}$ are parallel, then $\lambda$ is
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The correct answer is:
-4
$\frac{1}{2}=\frac{-2}{\lambda} \Rightarrow \lambda=-4$
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