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12 cards from this deck
A sequence where each term is found by adding the same fixed number to the previous term
aaa
ddd
d=any term−previous termd = \text{any term} - \text{previous term}d=any term−previous term
Tn=a+(n−1)dT_n = a + (n-1)dTn=a+(n−1)d
Sequence increases
Sequence decreases
The term you want to find
Position number of the term you want
Common difference added (n−1)(n-1)(n−1) times, not nnn times
Solve Tn=numberT_n = \text{number}Tn=number; nnn must be positive whole number
Substitute n=1,2,3n = 1, 2, 3n=1,2,3 to check original terms match
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