- n( A ∪ B ) = n(A) +n(B) – n (A ∩ B)
- n(A∪B)=n(A)+n(B) {when A and B are disjoint sets}
- n(U)=n(A)+n(B)–n(A∩B)+n((A∪B)c)
- n(A∪B)=n(A−B)+n(B−A)+n(A∩B)
- n(A−B)=n(A∩B)−n(B)
- n(A−B)=n(A)−n(A∩B)
- n(Ac)=n(U)−n(A)
- n(PUQUR)=n(P)+n(Q)+n(R)–n(P⋂Q)–n(Q⋂R)–n(R⋂P)+n(P⋂Q⋂R)
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