How to calculate the sum (1+2)+(2+3)+(3+4)+...(2012+2013)+(2013+2014)?

1 Answer
Feb 19, 2018

4056195

Explanation:

This sum has 2013 bracketed terms, with average value:

(1+2)+(2013+2014)2=2015

So the sum is:

20132015=201421=4056195