Whats the difference between the sum of the first 2003 even counting numbers and the sum of the first 2003 odd

Whats the difference between the sum of the first 2003 even counting numbers and the sum of the first 2003 odd counting numbers?Whats the difference between the sum of the first 2003 even counting numbers and the sum of the first 2003 odd
Since each of the even numbers is one unit larger than the corresponding odd value, the sum of 2003 one-unit differences will be 2003.