1. The problem statement, all variables and given/known data 1st terms = -e and positive e separated by d. 2nd terms = Two units of charge e form a system of 3 point charges -e, 2e, and e (all d apart). The next terms are formed by changing the sign of the charge and then moving by one unit length. 2. Relevant equations E=q(1)q(2)/d^2 3. The attempt at a solution The actual problem is finding the E-field of the distribution of charges. However, I can't get past the wording of how it's telling me to set up the 3rd charge distribution. What exactly is the pattern here?