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9 cards from this deck
Third difference of consecutive terms is constant
Tn=an3+bn2+cn+dT_n = an^3 + bn^2 + cn + dTn=an3+bn2+cn+d
6a6a6a
Quadratic sequence
Linear (arithmetic) sequence
Identify third common difference
Use 6a=6a =6a= third difference
Three equations
Substitute known terms into general formula
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