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     EduGorilla 
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    If a, b, c and d are unit vectors such that (a  b).(c  d) = 1 and a.c = 1/2, then

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    1. a, b and c are non-coplanar
    2. b, c and d are non-coplanar
    3. b and d are non-parallel
    4. a and d are parallel, and b and c are parallel
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Reply To: If a, b, c and d are unit vectors such that (a  b).(c  d) = 1 and a.c = 1/2, then….
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