SOLUTION: Find the sum of the first terms of arithmetic sequence 21,16,11,6

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Question 278195: Find the sum of the first terms of arithmetic sequence 21,16,11,6
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Simply add them up to get 21+16+11+6=54. I'm sure that there's more to the problem. Please post the entire problem.