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Question

If a,b,c are non-coplanar vectors, then [a×b b×c c×a]=

A
[abc]
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B
[abc]2
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C
1
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D
0
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Solution

The correct option is D [abc]2
[¯¯¯aׯ¯b¯¯bׯ¯c¯¯cׯ¯¯a]=(¯aׯb){(¯bׯc)×(¯cׯa)}
=(¯aׯb){[¯b¯c¯a]¯c[¯b¯c¯c]¯a}=((¯aׯb)¯c)([¯b¯c¯a])=[¯a¯b¯c]2

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