Finite Geometric Series
By DarthVader
Date: 2023-08-09
Topic: 199 see comments
Post views: 788
Finite Geometric Series
To find the number of terms in a finite series:
arn-1 = (put the last term in the series here…)
a = the first term
r = the common ratio found by dividing the second term by the first
n = the total number of terms
Divide both sides by ‘a’ and then take the natural log of both sides to solve for ‘n’
The sum of a finite geometric series is:
a(1 − rn) / (1 − r)
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