The ratio in which the line joining the points (2, 4, 5) and (3, 5, - 4) is divided by the YZ-plane, is
2 : 3
3 : 2
- 2 : 3
4 : - 3
If are such that each of them is perpendicular to the sum ofthe other two, then is equal to
A.
If a and b are the position vectors of A and B, then position vector of point C on AB produced such that AC = 3AB, is
3a - b
3b - a
3a - 2b
3b - 2a