Question

A scalar triple product  A B C  .

  

vanishes when

1. A



, B



and C



are not in the same plane

2. A



, B



and C



are in the same plane

3. C



is perpendicular to both A



and B



4. B



is perpendicular to both A



and C​

Answer 1

Answer:

I don't understand the Question

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Answer 2

I didn’t understand your question