12. Three vectors A, B and C satisfy the relation Ā.B = 0 and Ā. C = 0. The vector A is parallel to (A)] (B) Ĉ (C) B.C D) Bx C

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( vec{A} cdot vec{B}=0 Rightarrow vec{A} cdot mid vec{B} ) ( vec{A} cdot vec{C}=0 Rightarrow vec{A} perp vec{C} ) ( Rightarrow vec{A}left|operatorname{mull}_{V}(vec{D}) vec{B} times vec{C}=vec{theta}(vec{r} cdot vec{B} | vec{C})right. )

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