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OpenStudy (anonymous):
The first term in an arithmetic series is 9, while the last term in the series is –191. If there are 25 terms in the series, what is its sum? A) -4550 B) -2275 C) 2275 D) 4550
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OpenStudy (callisto):
use the formula sum = (first term + last term ) * no of terms / 2 = [9 + (-191)] *25/2 = -2275
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