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# Copy of Geometric Sequences and Series

Common Ratios Nth Term Sum of the N Terms Sum of an infinite series.
by

## Justin Herring

on 20 April 2011

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#### Transcript of Copy of Geometric Sequences and Series

Geometric Sequences and Series First thing's first:
A sequence is an ordered list of numbers. Furthermore, the sum of these terms in the sequences are called series. To find the terms in the sequence, you must find the common ratio(r) which is the fixed amount multiplied in order to get from one term to the next.
In order to find any term in the geometric sequence you must use the following formula: In here,
a1= is the first term of the sequence.
r= is the common ratio and
n= is the number of the term to find. Next: to find the sum of a specific number of terms, you must use the following formula :) In this equation,
Sn is the sum of the n terms
a1 is the first term and
r is the common ratio
n is the number of terms Example:
Find the common ratio.
3, -6, 12, -24, ... Example:
Find the 7th term of the sequence.
2, 6, 18, 54, ..... Find the sum of the first 8 terms of the
sequence:

-5, 15, -45, 135, ..... The END.
Ask ?'s :) r = -2 the 7th term is 1458 You should have gotten 8200
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