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8 cards from this deck
The sum of a geometric sequence
a+ar+ar2+ar3+ar4+...a+ar+ar^2+ar^3+ar^4+...a+ar+ar2+ar3+ar4+...
Sn=a(1−rn)1−rS_n=\frac{a(1-r^n)}{1-r}Sn=1−ra(1−rn)
First term
Common ratio
Number of terms
12\frac{1}{2}21
10238\frac{1023}{8}81023
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