The co - ordinates of centre of mass of particle of mass 10, 20 and 30 gm are (1, 1, 1) cm. The position co - ordinates of mass 40 gm which when added to the system, the position of combined centre of mass be at (0, 0, 0) are,

Options

A. (3/2, 3/2, 3/2)
B. `(-3//2, -3//2, -3//2)`
C. (3/4, 3/4, 3/4)
D. `(-3//4, -3//4, -3//4)`

Answer

B