Three masses 1 kg 2 kg and 3 kg are placed at the vertices of an equilateral triangle of side 1m. Find the gravitational potential energy of the system $(G=6.67 \times 10^{-11} Nm^2 /kg^2)$

Question

$$(a)\;-7.33 \times 10^{-10}\;J \quad (b)\; -6.42 \times 10^{-10}J \quad (c)\;-7.33 \times 10^{-9}\;J \quad (d)\;-6.42 \times 10^{-9}J$$