If a vector is added or subtravted from a vector, the resultant is a vector . Is this also true in case of multiplication to two vectros ?

Vector|Multiplication Of Vector

Adding of two vectors to get a single vector is termed as

When two vector vec a and vec b are added,the magnitude of the resultant vector is always

The resultant of two vectors will be minimum, if they are

The algebraic sum of two co - initial vectors is 16 units. Their vector sum is 8 units and the resultant of the vectors are perpendicular to the smaller vector. Then magnitudes of the two vectors are -

The algebraic sum of two co - initial vectors is 16 units. Their vector sum is 8 units and the resultant of the vectors are perpendicular to the smaller vector. Then magnitudes of the two vectors are -

Is it possible to get zero vector as a resultant of three non-coplanar vectors ? Is the same possible in case of four non-coplanar vectors?