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

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

Mar 23, 2018

### 3+0 Answers

#1
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What do you mean by formula, the sum? finding the nth term?

Mar 23, 2018
#2
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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.

Mar 23, 2018
#3
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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

Mar 23, 2018