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Question

If a,b,c are non-coplanar vectors and α=b×c,β=c×a,r=a×b then ∣ ∣ ∣α.aα.bα.cβ.aβ.bβ.cr.ar.br.c∣ ∣ ∣=

A
0
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B
[αβγ]2
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C
[αβγ]
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D
[abc]3
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Solution

The correct option is D [abc]3
Henceα=b×c,β=c×a,r×bFromtheαistobandcsoproductofαwithbandCwillbezerosameincaseofβandrwhereofβandrwheredotproductofthemwithperpendiculardirectionwillbezeroSomatrixnowwilllooklikeasαa000βb000ec=(αa)×(βb)×(rc)=[(b×c)a]×[(c×a)b]×[(a×b)c]=[abc]3

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