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Q.

The vectors a×(b×c), b×(c×a), c×(a×b) are

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a

collinear

b

coplanar

c

non-collinear

d

non-coplanar

answer is A.

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Detailed Solution

a×(b×c)=(a·c) b-(a·b) c b×(c×a)=(b·a) c-(b·c) a c×(a×b)=(c·b) a-(c·a) b

Let  x=a·b   y=b·c   z=c·a

  [a×(b×c)   b×(c×a)   c×(a×b)] =[a b c] 0z-x-y0xy-z0 =[a b c] -z(0-yz)-x(yz-0)=0

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