The X and Y coordinates of the three particles of masses m, 2m and 3m are respectively (0, 0), (1, 0) and (-2, 0). The X-coordinate of the centre of mass of the system is

Options

A. `(1)/(3)`
B. `(2)/(3)`
C. `-(1)/(3)`
D. `-(2)/(3)`

Answer

D