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July 2nd, 2018, 03:05 AM  #1 
Newbie Joined: Jul 2018 From: India Posts: 1 Thanks: 0  Summation of series
Hi, this is my first post on here. I haven't got a clue how to solve this question. I'm familiar with AP, GP, HP, AGP, some special series... I tried, but couldn't figure out how to approach this question. I have attached two pictures, one is the question and the other one is the answer to the question. Thanks 
July 2nd, 2018, 05:32 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 19,865 Thanks: 1833 
This is easy to do by mathematical induction.


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