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OpenStudy (anonymous):
7) Find S25 for -7+ -2 + 3 + 8 +…
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OpenStudy (irishboy123):
hint: s1 = -7 s2 = -7 + (1)5 s3 = -7 + 2(5) ........... you can keep going to 25(!) or find the formula and use it
OpenStudy (anonymous):
123?
OpenStudy (anonymous):
@IrishBoy123
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