It is 10x11/2 or 55.
You can also add
1+2+3+4+5+6+7+8+9+10=55
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The question makes no sense.. you can easily find the sum of integers between 1 and 300 but what does 11 or 13 have to do with it.
The sum of the integers from 1 to 100 inclusive is 5,050.
55 Basically the sum of al integers from 1 to n is Sn=(n²+n)/2 (Think why is this number always an integer!)
-10
The sum of integers from 1 to 2008 = 2008*2009/2 = 2017063