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Question

Position vector of 4 points are given as OA=2^i+3^j^k, OB=^i2^j+3^k, OC=3^i+4^j2^k and OD=^i6^j+6^k
and O be the origin. Then,

A
all the 4 points are vertices of the tetrahedron with volume 83
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B
all the 4 points are coplaner
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C
AB, AC, AD are orthogonal vectors
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D
all the 4 points are vertices of the tetrahedron with volume 43
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Solution

The correct option is B all the 4 points are coplaner
Given OA=2^i+3^j^k
OB=^i2^j+3^k
OC=3^i+4^j2^k
and OD=^i6^j+6^k
AB=^i5^j+4^kAC=^i+^j^kAD=^i9^j+7^k
Now
[AB AC AD]=∣ ∣154111197∣ ∣=2+3032=0
So all the 4 points are coplaner



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