What are coplanar vectors ?

What is a coplanar vector ? Give an example.

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?

If vecA,vecB and vecC are coplanar vectors, then

Show that the vectors 2veca-vecb+3vecc, veca+vecb-2vecc and veca+vecb-3vecc are non-coplanar vectors (where veca, vecb, vecc are non-coplanar vectors).

Show that the vectors 2veca-vecb+3vecc, veca+vecb-2vecc and veca+vecb-3vecc are non-coplanar vectors (where veca, vecb, vecc are non-coplanar vectors).

Show that the vectors 2veca-vecb+3vecc, veca+vecb-2vecc and veca+vecb-3vecc are non-coplanar vectors (where veca, vecb, vecc are non-coplanar vectors).

If veca, vecb, vecc, vecd are coplanar vectors, then (vecaxxvecb)xx(veccxxvecd)=

Any three coplanar vectors are

If veca,vecb,vecc are three coplanar vectors, then [vecavecbvecc] is