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OpenStudy (anonymous):
What is the sum of the arithmetic sequence 137, 125, 113 …, if there are 38 terms?
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OpenStudy (anonymous):
here the common difference is 125-137 = -12 u use the formula Sn = n/2 [2a + (n-1)d] where n = 38, d = -12 and a = first term = 137
OpenStudy (anonymous):
are u happy with calculating that?
OpenStudy (anonymous):
yes thank you!
OpenStudy (anonymous):
ok
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