98. What is the sum of the first 27 terms in the arithmetic series 25 +19+13 + ...?

sum of the first 27 terms = -1431

Step-by-step explanation:

arithmetic series sum of the first n terms formula:

n = 27 terms

first term, a = 25

common difference, d = 19 - 25 = -6

substitute the values into the formula

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