A system consists of 3 particles each of mass 'm' are located at (1, 1) (2, 2) and (3, 3). The co-ordinates of the centre of mass are

A system consists of 3 particles each of mass 2 kg located at (1,1), (2,2) and (3, 3) respectively. Find the coordinates of the centre of mass.

Centre of mass of two particles with masses 1kg and 2kg located at (2,0,2) and (1,1,0) has the co-ordinates of ?