Math Goodies is a free math help portal for students, teachers, and parents.
|
Interactive Math Goodies Software

testing left nav
 Math Forums @ Math Goodies Home | Profile | Active Topics | Members | Search | FAQ
 All Forums  Homework Help Forums  Pre-Calculus and Calculus  Geometric & arithmetic sequences... precalc help

Note: You must be registered in order to post a reply.

Screensize:
Format Mode:
Format:

Message:
* HTML is OFF
* Forum Code is ON

 Math Symbols

Check here to subscribe to this topic.

 T O P I C    R E V I E W happysharlee Posted - 01/03/2011 : 19:25:50 Suppose that a, b, and c are three consecutive terms in a geometric sequence. Show that 1/(a+b) , 1/(2b) , and 1/(c+b) are three consecutive terms in an arithmetic sequence. I have no clue how to approach this question! It's from my textbook, so i know all relevant equations/formulas. Please help me out, my teacher is very strict.EDIT:I have a second question:Let b denote a positive constant. Find the sum of the first n terms in the sequence 1/(1+b) , 1/(1-b) , 1/(1-b) , ...I get that the denominators must form some kind of arithmetic sequence, but I can't for the life of me figure out what the common difference could be... please help!! 1   L A T E S T    R E P L I E S    (Newest First) Dr.Steve Posted - 01/04/2011 : 19:22:40 Since the sequence is geometric there is a common ratio r. Then b=ar and c= ar. See if you can take it from there.

 Math Forums @ Math Goodies © 2000-2004 Snitz Communications