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April 7th, 2015, 07:29 AM  #11 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  
April 7th, 2015, 07:33 AM  #12 
Member Joined: Mar 2015 From: KY Posts: 35 Thanks: 1 
I'm missing something, when I use the formula I get 34,440.

April 7th, 2015, 07:33 AM  #13 
Math Team Joined: Jul 2011 From: Texas Posts: 2,881 Thanks: 1503 
TI84 screenshot ...

April 7th, 2015, 07:39 AM  #14 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms 
Not to be outdone, here's a PARI/GP screenshot:

April 7th, 2015, 08:25 AM  #15 
Member Joined: Mar 2015 From: KY Posts: 35 Thanks: 1 
OK, I got it. If I put the whole expression in the calculator I get the right answer. Thanks 

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geometric, sequence 
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