If a,b and c are non-coplanar vectors, then prove that the four points `2a+3b-c,a-2b+3c,3a+4b-2c and a-6b+6c` are coplanar.

It a,b and c are non-coplanar vectors and the four points with position vectors 2a+3b-c, a-2b+3c, 3a+4b-2c and ka-6b+6c are coplanar, then k=

If vec a,vec b and vec c are non-coplanar vectors,prove that the four points 2vec a+3vec b-vec c,vec a-2vec b+3vec c,3vec a+4vec b-2vec c and vec a-6vec b+6vec c are coplanar.anplanar

If vec a,vec b and vec c are non-coplanar vectors, prove that the four points 2vec a+3vec b-vec c,vec a-2vec b+3vec c,3vec a+4vec b-2vec c and vec a-6vec b+6vec c are coplanar.

If a,b and c are non-coplanar vectors, prove that 3a-7b-4c, 3a-2b+c and a+b+2c are coplanar.

If a,b and c are non-coplanar vectors, prove that 3a-7b-4c, 3a-2b+c and a+b+2c are coplanar.

If a,b and c are non-coplanar vectors, prove that 3a-7b-4c, 3a-2b+c and a+b+2c are coplanar.

If a,b and c are non-coplanar vectors, prove that 3a-7b-4c, 3a-2b+c and a+b+2c are coplanar.

If a,b and c are non-coplanar vectors, prove that 3a-7b-4c, 3a-2b+c and a+b+2c are complanar.

a,b,c are three non-coplanar vectors. Show that the points with p.y's 6a-4b+10c,-5a+3b-10c,4a-6b-10c and 2b+10c are coplanar.