We are given m and n we need to find SUM n m. Sum of the simplest arithmetic progression consisting of the n first natural numbers 3. .
Sum of the First n Natural Numbers We prove the formula 1 2.
The sum of the first natural numbers is. Sum for 5 6 7 8 n n n 1 2 10 And for any starting number a. There is a simple applet showing the essence of the inductive proof of this result. .