"Three equal point charges, each with charge 1.55 , are placed at the vertices of an equilateral triangle whose sides are of length 0.350 . What is

"Three equal point charges, each with charge 1.55 , are placed at the vertices of an equilateral triangle whose sides are of length 0.350 . What is the electric potential energy of the system? (Take as zero the potential energy of the three charges when they are infinitely far apart.)" Use = 8.85×10−12 for the permittivity of free space.