If the vectors , and are three non-coplanar vectors and , then the value of abc is
0
1
2
- 1
187.
Let , and be three vectors. A vector in the plane of whose projection on is magnitude , is
188.
If the constant forces and -i^+2j^-k^act on a particle due to which it is displaced from a point A (4,- 3, - 2) to a point B (6, 1,- 3), then the work done by the forces is