Find the charge distribution pattern.

[Aesteus]

Homework Statement

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.

Homework Equations

E=q(1)q(2)/d^2

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?

 

[SammyS]

Homework Statement

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.

Homework Equations

E=q(1)q(2)/d^2

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?

Please give the complete problem, word for word.