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If $\mathbf{a} \times(\mathbf{b} \times \mathbf{c})=\mathbf{0}$, then
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The correct answer is:
$\mathbf{b} \| \mathbf{c}$
$\quad \mathbf{a} \times(\mathbf{b} \times \mathbf{c})=\mathbf{0} \Rightarrow \mathbf{a} \|(\mathbf{b} \times \mathbf{c})$ or $\mathbf{b} \times \mathbf{c}=\mathbf{0}$ i.e., $\mathbf{b} \| \mathbf{c}$ or $\mathbf{a}=\mathbf{0}$.
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