Summation Notation - Variable in the exponent

[Goldenwind]

[SOLVED] Summation Notation - Variable in the exponent

Homework Statement

This is an example formula.

How do I solve a summation if something is in the form of Sum(c^i), where c is some constant?

 

[Dick]

Then it's geometric series. You'll want |c|<1.

 

[Goldenwind]

Thank-you :)