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OpenStudy (anonymous):
The first term of a finite arithmetic sequence is 20 and the last is 50. The sum of this series is 385. How many terms does it have? (please show working)
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OpenStudy (mertsj):
Sum = n(1st term + last term)/2 385 = n(20+50)/2 385 = 35n n=11
OpenStudy (anonymous):
Thanks alot
OpenStudy (mertsj):
yw
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