Overcounting

Overcounting is the process of counting more than what you need and then systematically subtracting the parts which do not belong.

The Principle of Inclusion-Exclusion (PIE) is a systematic method of repeated overcounting that is a tool in solving many combinatorics problems.

Examples

• AIME 2004I/3 2004 AIME I Problems/Problem 3

This article is a stub. Help us out by expanding it.