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

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asked Apr 13, 2017 223k views

1 Answer

Ethree · Answer 1 · 2017-04-20T14:04:19+0000

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

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

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