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

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Question 963802: what is the sum of the last four terms of the series 7+9+11+...+21?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
The difference between terms is 2.
The last four terms are 21, 19,17, and 15.
S=21%2B19%2B17%2B15