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February 17th, 2012, 07:48 PM  #1 
Newbie Joined: Jan 2012 Posts: 28 Thanks: 0  Finding sum of the terms
Consider the following sequence, which consists of 2s and 9s only: 2, 9, 2, 2, 9, 2, 2, 2, 9, 2, 2, 2, 2, 9 ... A single 9 separates each group of 2s, and each group of 2s contains one more 2 than the previous group of 2s. What is the sum of the terms that precede the 29th 9? 
February 17th, 2012, 07:53 PM  #2 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 522 Math Focus: Calculus/ODEs  Re: Finding sum of the terms
Preceding the 29th 9, there will be 28 9's and the number of 2's is: Thus, the sum S is: 

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