Current time: 0:00Total duration: 3:32

0 energy points

# Proof of finite arithmetic series formula

Watch Sal prove the expression for the sum of all positive integers up to and including n. Created by Sal Khan.

If you're seeing this message, it means we're having trouble loading external resources for Khan Academy.

If you're behind a web filter, please make sure that the domains ***.kastatic.org** and ***.kasandbox.org** are unblocked.

Main content
# Proof of finite arithmetic series formula

Current time: 0:00Total duration: 3:32

0 energy points

Watch Sal prove the expression for the sum of all positive integers up to and including n. Created by Sal Khan.