Exam question t/f 2

What are n1 and n2, and what is "the plan"?

 

What plane is this? n1 x n2 is a vector, and for any given vector there are infinitely many planes it does not intersect.

 

What is "the" plane in the question? Or was that really "a" plane?

 

You could tell us the complete and exact wording of the question. I have read up through post #8 and I still have no idea what this is about.

 

What a poorly worded question then. Vectors don't intersect planes. Lines with the given vector as a direction vector might. It would better be stated as the contrapositive: If ##\vec n_1 \times \vec n_2 \ne \vec 0## a line with that direction vector intersects the plane in exactly one point.