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If there are N charges, q1,q2,q3 and so on qN and their position vectors from a fixed point are r1,r2,r3 and so on rN.
So, the electric potential due to all these charges at the fixed point is-
V= 1/V1+1/V2+.....
V= 1/4πεo (q1/r1+q2/r2+....+qN/rN)