How to find sum of arithmetic sequence

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find a1 in arithmetic series

The sum of an arithmetic sequence is “the sum of the first $$n$$ terms” of the sequence and it can found using one of the following formulas: \[\begin{align} S_n &= \frac{n}{2}(2a+(n

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How do you find the sum of the arithmetic sequence 2 + 5 + 8

Example: Add up the first 10 terms of the arithmetic sequence: { 1, 4, 7, 10, 13, } The values of a, d and n are: a = 1 (the first term) d = 3 (the common difference between terms) n = 10 (how

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