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10 cards from this deck
A sequence where the second difference is constant
Tn=an2+bn+cT_n = an^2 + bn + cTn=an2+bn+c
2a2a2a
Forms a linear (arithmetic) sequence
Second difference = 2a2a2a, solve for aaa
Substitute terms, solve simultaneously
Quadratic sequence
111
12\frac{1}{2}21
12n2+12n\frac{1}{2}n^2 + \frac{1}{2}n21n2+21n
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