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10 cards from this deck
Sum of terms in a sequence
Sum of first nnn terms of a sequence
Sum of specific, limited number of terms
S∞S_\inftyS∞
∣r∣<1|r| < 1∣r∣<1
Summation
iii (variable that changes)
n−m+1n - m + 1n−m+1
Sn=n2(2a+(n−1)d)S_n = \frac{n}{2}(2a + (n-1)d)Sn=2n(2a+(n−1)d)
S∞=a1−rS_\infty = \frac{a}{1-r}S∞=1−ra where ∣r∣<1|r| < 1∣r∣<1
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