Finding a Term of an Arithmetic SeriesDate: 12/13/95 at 20:17:48 From: Rodrigo Loyola Subject: math question The fifth term of an arithmetic series is 16 and the sum of the first 10 terms is 145. Write the first three terms. Date: 12/14/95 at 22:31:47 From: Doctor Ken Subject: Re: math question Hello! Here's a hint: we can think of our arithmetic series as this: a, a+d, a+2d, a+3d, a+4d, a+5d, a+6d, ... Now all we'd have to do is figure out what a and d are, and we'd know what the entire series is. See if you can figure out a couple of equations (from your statement of the problem) that would let you find a and d. Good luck! - Doctor Ken, The Geometry Forum |
Search the Dr. Math Library: |
[Privacy Policy] [Terms of Use]
Ask Dr. Math^{TM}
© 1994- The Math Forum at NCTM. All rights reserved.
http://mathforum.org/dr.math/