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OpenStudy (anonymous):
Evaluate the summation of negative 5 n minus 1, from n equals 3 to 12.
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OpenStudy (anonymous):
just plug in the numbers 5(3)-1 and solve
OpenStudy (amistre64):
there is a less brute manner to do it, but that is effective nonetheless
OpenStudy (amistre64):
since 5n-1 is an arithmetic sequence: then n(first+last)/2 will work
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