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10 cards from this deck
A sequence with a common ratio between consecutive terms
Divide a term by its previous term
First term
Common ratio
un=arn−1u_n = ar^{n-1}un=arn−1
Sn=a(1−rn)1−rS_n = \frac{a(1-r^n)}{1-r}Sn=1−ra(1−rn)
ararar
ar2ar^2ar2
222
12\frac{1}{2}21
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