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10 cards from this deck
b−a=c−bb - a = c - bb−a=c−b
ba=cb\frac{b}{a} = \frac{c}{b}ab=bc
b2=acb^2 = acb2=ac
Subtraction
Division
Tn=a+(n−1)dT_n = a + (n-1)dTn=a+(n−1)d
Tn=arn−1T_n = ar^{n-1}Tn=arn−1
Small target values, quick answer, calculator available
Large values, exact solution, trial-and-error too long
2b=a+c2b = a + c2b=a+c
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