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Regions:
- A only (a)
- B only (b)
- A ∩ B (c)
- Outside both (d)
Formulas:
$$n\left(A\ ∪\ B\right)=n\left(A\right)+n\left(B\right)-n\left(A\ ∩\ B\right)$$
$$n\left(A^c\ ∪\ B^c\right)=n\left(A∩B\right)^c$$
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Regions:
Formulas:
$$n\left(A\ ∪\ B\right)=n\left(A\right)+n\left(B\right)-n\left(A\ ∩\ B\right)$$
$$n\left(A^c\ ∪\ B^c\right)=n\left(A∩B\right)^c$$
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