a = 1 (the first term) d = 3 (the common difference between terms)

Arithmetic sequences are sequences in which their terms are formed from the previous term by adding a certain number called the common difference. The sum of the first n terms of an

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Plug the values into the alternative arithmetic series formula. This is the system of equations that we are going to solve by the Elimination Method. Multiply equation #1 by -12 −12. Then add it to equation #2. We get {d=2} d = 2. After

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