(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Show that, if a>0 and 0<r<1, then for all n>=1 , a+ar+ar^2+...+ar^n < a/r -1

2. Relevant equations

3. The attempt at a solution

could someone please give me some hints as to how to start this questions. thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Prove a + ar + ar^2 + + ar^n < a/r - 1

**Physics Forums | Science Articles, Homework Help, Discussion**