SOLUTION: any AP series and find the sum of first 21 terms
Algebra.Com
Question 998564: any AP series and find the sum of first 21 terms
Answer by ikleyn(52790) (Show Source): You can put this solution on YOUR website!
.
1, 2, 3, . . . , 21.
S = 1 + 2 + 3 + . . . + 21 = = 11*21 = 231.
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