How to Derive the Sum of Arithmetic Sequence Formula? Step 2: Put the given values in the appropriate formula, S n = n/2 or S n = n/2.Step 1: Identify the given values: a 1 = the first term, d = the common difference between the terms, n = the total number of terms in the sequence and a n = the last term.We use the sum of the arithmetic sequence formula to find the sum of series formula: How to Use the Sum of Arithmetic Sequence Formula? when n th term(a n) is known: S n = n/2. when n th term is not known: S n = n/2.The sum of the arithmetic sequence formula: \(\begin\)Īnswer: Sum of arithmetic sequence 1, 5, 9, 13, …… (up to 20 terms) = 780.įAQs on Sum of Arithmetic Sequence Formula What are Different Sum of Arithmetic Sequence Formulas? Using the sum of arithmetic sequence formula, Learn the why behind math with our certified expertsīook a Free Trial Class Examples Using Sum of Arithmetic Sequence FormulaĮxample 1: Find the sum of arithmetic sequence -4, -1, 2, 5. Thus, S n = n/2, which is another formula to find the sum of arithmetic series.īecome a problem-solving champ using logic, not rules.
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