My Math Forum Finding sum of the terms
 User Name Remember Me? Password

 Algebra Pre-Algebra and Basic Algebra Math Forum

 February 17th, 2012, 06:48 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, 06:53 PM #2 Senior Member     Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 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: $\frac{29\cdot30}{2}=435$ Thus, the sum S is: $S=28\cdot9+435\cdot2=1122$

 Tags finding, sum, terms

,

,

,

,

,

,

,

,

,

,

,

,

,

,

### Find sum of the series to the 17th term(a)50 49 48 --- 1

Click on a term to search for related topics.
 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post Agata78 Number Theory 5 January 14th, 2013 06:15 AM 1love Algebra 8 May 20th, 2012 08:49 PM Solarmew Applied Math 5 May 7th, 2012 08:16 PM riponks Elementary Math 5 September 24th, 2009 03:50 AM Soha Algebra 4 December 19th, 2006 04:23 PM

 Contact - Home - Forums - Cryptocurrency Forum - Top