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10 cards from this deck
Sequence with constant difference between consecutive terms
Sum of finite number of terms from arithmetic sequence
Tn=a+(n−1)dT_n = a + (n - 1)dTn=a+(n−1)d
Sn=n2[2a+(n−1)d]S_n = \frac{n}{2}[2a + (n - 1)d]Sn=2n[2a+(n−1)d]
Sn=n2(a+l)S_n = \frac{n}{2}(a + l)Sn=2n(a+l)
Pair terms from opposite ends; each pair gives same sum
Tn=Sn−Sn−1T_n = S_n - S_{n-1}Tn=Sn−Sn−1
ddd
Sequence lists terms; series adds them
5050
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