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OpenStudy (anonymous):
@RaphaelFilgueiras
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OpenStudy (anonymous):
Find the sum of the arithmetic sequence. -1, 2, 5, 8, 11, 14, 17
OpenStudy (anonymous):
@RaphaelFilgueiras
OpenStudy (anonymous):
Sn=(a1+an).n/2
OpenStudy (anonymous):
i got 56, correct?
OpenStudy (anonymous):
7*8
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OpenStudy (anonymous):
so im right? @RaphaelFilgueiras
OpenStudy (anonymous):
yes lol
OpenStudy (anonymous):
hahahha just making sure
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