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OpenStudy (anonymous):
1 MEDALL PLEASE HELP;/what is the sum of the arithmetic sequence 149,135,121...if there are 28 terms
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OpenStudy (anonymous):
1 + 2 +3 +... + n = n(n+1)/2 can use this to answer question. Hint: Work with 149 - (7)(1 + 2 + 3 ...)
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