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OpenStudy (studygurl14):
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OpenStudy (studygurl14):
jimthompson5910 (jim_thompson5910):
I'm getting 945 as well S = n*(a1 + an)/2 S = n*(a1 + a1 + d(n-1))/2 S = 21*(5+5 + 4(21-1))/2 S = 945
OpenStudy (studygurl14):
Thank you. :)
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