(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

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

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