If a , b , c and are unit vectors such that ( a b ) ( c d )=1 and a c = 1 2 , then
Mathematics · JEE Advanced · NTA Exams — Vector Algebra
If \(\vec{a}, \vec{b}, \vec{c}\) and 
are unit vectors such that \((\vec{a} \times \vec{b}) \cdot(\vec{c} \times \vec{d})=1\) \(\text { and } \vec{a} \cdot \vec{c}=\frac{1}{2} \text {, then }\)
are unit vectors such that \((\vec{a} \times \vec{b}) \cdot(\vec{c} \times \vec{d})=1\) \(\text { and } \vec{a} \cdot \vec{c}=\frac{1}{2} \text {, then }\)
are non-coplanar- are non-coplanar
are non-parallel
are parallel and 
are parallel
Answer
(D) are parallel and are parallel
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