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12 cards from this deck
Tn=a+(n−1)dT_n = a + (n-1)dTn=a+(n−1)d
First term of the sequence
Common difference
The nth term
Position of the term
Write down the general term formula for each given term
ddd first, then aaa
Subtract one equation from the other
Common difference must be same: T2−T1=T3−T2T_2 - T_1 = T_3 - T_2T2−T1=T3−T2
Forgetting the (n−1)(n-1)(n−1)
Substitute values back into the original given terms
To solve for two unknowns (aaa and ddd)
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