SOLUTION: 1 + 2 + ... + 80
Algebra.Com
Question 988472: 1 + 2 + ... + 80
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
1 + 2 + ... + 80
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There are 80 elements.
The average is (1+80)/2 = 40.5
--> 80*40.5
= 3240
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