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Three overlapping formulas of Austrian number in overlapping problem
Three-quantity overlapping problem

Class a,

Class b sum

The sum of the number of class C elements A = the number of class elements+the number of class C elements+the number of class C elements-both class A and class B.

The number of elements of a class-the number of elements of both Class B and Class C-the number of elements of both Class A and Class C+the number of elements of both Class A, Class B and Class C, symbolically: ABBC ABBC ABBC =+-+.

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