#addition_principle

Addition principle

Counting principle in combinatorics

In combinatorics, the addition principle or rule of sum is a basic counting principle. Stated simply, it is the intuitive idea that if we have A number of ways of doing something and B number of ways of doing another thing and we can not do both at the same time, then there are ways to choose one of the actions. In mathematical terms, the addition principle states that, for disjoint sets A and B, we have , provided that the intersection of the sets is without any elements.

Mon 6th

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