For this problem, assume that you are to pick 3 cars from the motor pool, which contains 7 subcompact cars, 4 compact cars, and
1 answer:
You might be interested in
One could use the relation
where
are two vectors, 
denotes the norm of that vector, and 
is the angle between the two vectors.
Then the two vectors will be parallel if
or 
.
where
Then the two vectors will be parallel if