The gravitational potential ($V$) at a point due to a system of particles is the scalar sum of the potentials due to individual particles. $V = -\sum \frac{GM_i}{r_i}$ Given that each mass $M = 2$ kg and the distances are $r_1 = 1, r_2 = 2, r_3 = 4, r_4 = 8, \dots$ The total potential at the origin is: $V = -G \left( \frac{2}{1} + \frac{2}{2} + \frac{2}{4} + \frac{2}{8} + \dots \right)$ $V = -2G \left( 1 + \frac{1}{2} + \frac{1}{4} + \frac{1}{8} + \dots \right)$ The term in the bracket is an infinite geometric series with first term $a = 1$ and common ratio $r = 1/2$. The sum of an infinite GP is $S = \frac{a}{1-r} = \frac{1}{1 - 0.5} = \frac{1}{0.5} = 2$. Substituting this back into the expression for $V$: $V = -2G \times 2 = -4G$.