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OpenStudy (anonymous):
Find S20 for the series -1 + -3 + -5 + -7 +...
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OpenStudy (anonymous):
I got 13
OpenStudy (anonymous):
I'm going to assume S20 is the 20th space, -1 being the first. -1 -3 -5 -7 -9 -11 -13 -15 -17 -19 -21 -23 -25 -27 -29 -31 -33 -35 -37 -39 The given order is in increments of +2, so, the 20th interval would be 39.
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