what is the sum of the last four terms of the series 7+9+11+...+21

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01-04-2016
Mathematics

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what is the sum of the last four terms of the series 7+9+11+...+21

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summer71 summer71 · Answer 1 · 2016-04-01T15:20:36+02:00

summer71 summer71

01-04-2016

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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