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21 November, 14:12

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

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  1. 21 November, 14:23
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    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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