55 Basically the sum of al integers from 1 to n is Sn=(n²+n)/2 (Think why is this number always an integer!)
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The sum of the integers from 1 to 100 inclusive is 5,050.
-10
The sum of integers from 1 to 2008 = 2008*2009/2 = 2017063
-10 and -14
55