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If four distinct points with position vectors c , b , a    and d  are coplanar, then ] c b a [    is equal to

1. ] c b d [ ] d c a [ ] a b d [           
2. ] c b d [ ] a c d [ ] b d a [           
3. ] b d c [ ] a d b [ ] a c d [           
4. ] a b d [ ] c a d [ ] d c b [       

Correct answer: ] b d c [ ] a d b [ ] a c d [           

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