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OpenStudy (anonymous):
What is the sum of a 17–term arithmetic sequence where the first term is 7 and the last term is –105?
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OpenStudy (anonymous):
a) –833 b) –893 c) –913 d) –943
OpenStudy (amistre64):
theres a formula for this that goes: n --- (first + last) 2
OpenStudy (amistre64):
17(7-105)/2
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