Three point masses of `1kg`, `2kg` and `3kg` lie at `(0,0)`, `(1,2)`, `(3,-1)` respectively. Calculate the coordinates of the centre of mass of the system.

Explanation

To calculate the coordinates of the center of mass of a system of point masses, we can use the following formulas:

1. **Formula for the x-coordinate of the center of mass (X_COM)**:
\[ X_{COM} = \frac{M_1 X_1 + M_2 X_2 + M_3 X_3}{M_1 + M_2 + M_3} \]

2. **Formula for the y-coordinate of the center of mass (Y_COM)**:
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