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12 cards from this deck
The sum of the terms of an arithmetic sequence
Sequence lists numbers; series adds them together
Sum of the first nnn terms of a series
The first term
Common difference between consecutive terms
The nnnth individual term
Sn=n2[2a+(n−1)d]S_n = \frac{n}{2}[2a + (n-1)d]Sn=2n[2a+(n−1)d]
Tn=Sn−Sn−1T_n = S_n - S_{n-1}Tn=Sn−Sn−1
Number of terms we want to add
Identify aaa and ddd
Disregard them; nnn must be positive
Average of first and last terms × number of terms
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