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Rob D.

asked • 06/11/15

When to use these formulas?

Arithmetic:
A. an=a1+(n-1)d
 
B. Sn=n(a1+an)/2
 
Geometric:
C. an=a1(r)n-1
 
D. Sn=a1(1-rn)/1-r
 
Infinite Geometric:
E. S∞ = a1/1-r
 
Can you give me examples of problems that will require said formulas?

1 Expert Answer

By:

Andrew M. answered • 06/12/15

Tutor
New to Wyzant

Mathematics - Algebra a Specialty / F.I.T. Grad - B.S. w/Honors

Rob D.

Thanks Andrew, you're a great help as always.
Report

06/12/15

Andrew M.

You're welcome Rob. Hope this clears it up some.
Report

06/12/15

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