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9 cards from this deck
Contribute less to total sum as nnn increases
∣r∣<1|r| < 1∣r∣<1
S∞=a1−rS_\infty = \frac{a}{1-r}S∞=1−ra
Digit repeats to infinity
Dot on top of repeating digit(s)
Use sum to infinity on repeating part
323232
Geometric series to infinity
1190\frac{11}{90}9011
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