All formulas of three kinds of overlapping problems

All formulas of three kinds of overlapping problems: total number-number of overlapping objects = quantity.

A∪B∪C represents the area covered by three circles of ABC; A∩B∩C means that three conditions are met. Pay attention to two points in practical problem solving:

① The figure does not show anything that does not conform to ABC.

(2) A ∩ B contains A∩B∩C and only satisfies A∩B=A∩B-A∩B∩C, and so on.

definition

If there are three things to count: A, B and C, then the sum of elements of A, B and C = A+B+C-both A and B-both A and C-both B and C+ both A, B and C. (A ∪ B ∪ C = A+B+C-A ∪.

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