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OpenStudy (anonymous):
What is the sum of the last four terms of the series 7+9+11+...+21?
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OpenStudy (australopithecus):
7 - 9 = 2 9 - 11 = 2 You should see that the series just increases by +2 therefore you can figure out what the last four terms are and then add them up one of the last terms given is 21
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