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Question

The points 2^i^j^k,^i+^j+^k,2^i+2^j+^k,2^j+5^k are

A
collinear
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B
coplanar but not collinear
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C
noncoplanar
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D
none
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Solution

The correct option is B coplanar but not collinear
AB=^i+2^k,AC=^j+2^k,AD=2^i+^j+6^k,
A, B, C, D are not collinear.
Box=∣ ∣102012216∣ ∣=1(62)+2(0+2)=4+4=0.
A, B, C, D are coplannar.

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