A vector that is perpendicular to both the vectors \( \vec{a}=\hat{...

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A vector that is perpendicular to both the vectors \( \vec{a}=\hat{i}-2 \hat{j}+\hat{k} \) and \( \vec{b}=\hat{i}-\hat{j}+\hat{k} \) is
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(A) \( -\hat{i}+\hat{k} \)
(B) \( -\hat{\mathrm{i}}-2 \hat{\mathrm{j}}+\hat{\mathrm{k}} \)
(C) \( \hat{i}-2 \hat{j}+\hat{k} \)
(D) \( \hat{i}+\hat{k} \)
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