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OpenStudy (anonymous):
Find the sum of the first 15 terms of the arithmetic sequence whose first term is 6 and whose 15th term is 104.
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OpenStudy (anonymous):
= (104+6)*15/2 = 110*15/2 = 55*15 = 825
OpenStudy (anonymous):
yes 825
OpenStudy (anonymous):
thank u!!!!!!
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