Explain the terms in formula sn=n/2(2a+n-1×d)
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Originally Answered: In the formula sn=n/2(2a+(n-1)d), what is a? ... The formula you describe is the sum of the first of the arithmetic sequence. For example, in the arithmetic sequence 2, 5, 8, 11, 14, 17, 20, 23, …, the first term is 2, which is . The common difference, , is 3.
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