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MC-IV week 1 homework help

 
 
Picture of William Chen
Re: MC-IV week 1 homework help
by William Chen - Sunday, June 17, 2018, 4:35 PM
 
Is there a typo in the problem? I think the right hand side should be 

Should $\sum_{i=1}^n a_n^{x-y}$ be $\sum_{i=1}^n a_i^{x-y}$