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 find the coordinates of the center of mass of the system of three point masses, we can use the formula for the center of mass (CM) in two dimensions. The coordinates of the center of mass (X_cm, Y_cm) can be calculated using the following formulas:

1. **Identify the masses and their coordinates:**
- Mass \( m_1 = 1 \, \text{kg} \) at coordinates \( (x_1, y_1) = (0, 0) \)
- Mass \( m_2 = 2 \, \text{kg} \) at coordinates \( (x_2, y_2) = (1, 2) \)
- Mass \( m_3 = 3 \, \text{kg} \) at coordinates \( (x_3, y_3) = (3, -1) \)

2. **Calculate the total mass:**
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