Geometric Sequences

​Geometric Series

Make sure to take notes!!! ​

The sum of the terms in a geometric sequence.

Ex:

10 + 5 + 2.5 + ....​

Geometric Series

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A sequence in which each term is found by multiplying the previous number by the same number.

Ex:

3, 6, 12, 24, ... (multiplied by 2)

Geometric Sequence

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In a geometric sequence, each term increases by the same ratio. ​

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Geometric Sequence Formula

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The common ratio is the number that is multiplied to the previous number in a geometric sequence to get the next number in the sequence.

Como Ratio (r)

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The Greek Letter meaning summation or sum of ​

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Symbol used for Geometric Sequence (Sigma).

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NOTE: Formula for terms is whatever function we use. ​Depending on the problem.

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What does the Sigma notation mean? ​

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The variable "n" represents the number of terms in the series.

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"n"

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"g1" represents the first term of the series (sequence). ​

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Geometric Series Formula​

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To calculate each sum, you must start myltipling the last term by the common ratio and sutract the first term. Then, you divide the quantity by 1 less than the common ratio.

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Sn = ((last term)(commonratio) - first term​)) / (common ratio - 1)

A series with a finite number of terms (never ends)

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Finate Series

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