Using the sum of an arithmetic sequence formula,Īnswer: Sum of arithmetic sequence 8,3,-2 …… = -790.Įxample 2 : Find the sum of 9 terms of an arithmetic sequence whose first and last terms are 22 and 44 respectively.Sum of arithmetic progression The sum of arithmetic progression is denoted by $S_ \times24$. Solution: Here a = 8, d = 3 – 8 = -5, n = 20 The sum of an arithmetic series is found by multiplying the number of terms times the average of the first and last terms. can be manually calculated by adding the terms together: 2 + 4 + 6 + 8 20.
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