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12 cards from this deck
Difference between consecutive terms
555
Tn=a+(n−1)⋅dT_n = a + (n-1) \cdot dTn=a+(n−1)⋅d
Tn=5n−2T_n = 5n - 2Tn=5n−2
989898
15th term
Second differences are constant
Tn=an2+bn+cT_n = an^2 + bn + cTn=an2+bn+c
aaa is half of second difference
Tn=n2+3T_n = n^2 + 3Tn=n2+3
103103103
Sequence is quadratic
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