Questions about the world of GMAT Math from other sources and general math related questions.
webmanik
Course Students
 
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Joined: Wed Dec 31, 1969 8:00 pm
 

Series Formulas / Scope

by webmanik Mon Jul 11, 2011 7:13 pm

Are these formulae useful on the test ? I want to make sure, that i'm not overlooking some basic foundations in GMAT math, which would preclude me from using these formulae on arithmetic progressions.

Term n of a series given first term, An = A1 + (n-1)d
Term n of a series given m'th term, An = Am + (n-m)d

Sum of n terms = (A1+ An) / 2
or = (2A1 + (n-1)d) / 2
jnelson0612
ManhattanGMAT Staff
 
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Joined: Fri Feb 05, 2010 10:57 am
 

Re: Series Formulas / Scope

by jnelson0612 Sun Jul 17, 2011 6:33 pm

Most definitely! These are good formulas to know.
Jamie Nelson
ManhattanGMAT Instructor