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For arithmetic sequences, the common difference is d, and the first term a1 is often referred to simply as "a". Since you get the next term by adding the common difference, the value of a2 is just a + d. The third term isa3 = (a + d) + d = a + 2d. The fourth term is a4 = (a+ 2d) + d = a + 3d. Following this pattern, the n-th term an will have the form an = a + (n – 1)d.
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