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What is the formula for an arithmetic series? Geometric series? Arithmetic sequence? Geometric series?

Guest Mar 23, 2018
 #1
avatar+627 
+1

What do you mean by formula, the sum? finding the nth term?

supermanaccz  Mar 23, 2018
 #2
avatar+627 
+2

Here they are anyways:

 

Finding the nth term: A= A+ d * (n - 1)  

 

Sn = (n/2)*(A+ An)

 

d is the common difference, An is the nth term, A1 is the first term.

supermanaccz  Mar 23, 2018
 #3
avatar+627 
+2

For geometric series, there are many difference formulas to find the sum. 

 

For infinite geometric series, those that don't have an end, (A1)/(n-1)

 

For those that do have an end, S= [A1(1-rn)]/(1-r)

 

r is the common ratio, Ais the first term and n is the nth term. 

 

To find the nth term: 

 

An = ARn-1

supermanaccz  Mar 23, 2018

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