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Question

Let a=a1i+a2j+a3k,b=b1i+b2j+b3k, and c=c1i+c2j+c3k be three non-zero vectors such that c is unit vector perpendicular to both vectors a and b. If the angle between vectors a and b is π6, then ∣ ∣a1a2a3b1b2b3c1c2c3∣ ∣2 is equal to

A
0
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B
1
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C
14(a21+a22+a23)(b21+b22+b23)
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D
34(a21+a22+a23)(b21+b22+b23)(c21+c22+c23)
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Solution

The correct option is C 14(a21+a22+a23)(b21+b22+b23)
We have, ∣ ∣a1a2a3b1b2b3c1c2c3∣ ∣2=[abc]2=[(a×b).c]2
=[|a||b|sinπ6c.c]2=|a|2|b|2sin2π6.1(|c|=1)
=(a21+a22+a23)(b21+b22+b23)×14=14(a21+a22+a23)(b21+b22+b23)

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