I apologize in advance that this is a more theoretical question. I have taken a couple of college- and graduate-level stats classes, but never precalculus or calc. I am kind of teaching these things to myself as I come across them in a book about MatLab basics (oh yes, I'm teaching myself that too because someone in our lab needs to be able to use the program for analysis and running experiments). So my question is...please give an example of how geometric progression can help me in statistics or digital signal processing? Or anything, really...I guess I am just wondering why I would ever want to determine the sum of a geometric progression.