Cardinality of Two Sets
Venn diagrams · Survey problems
Read the four regions of a two-set Venn diagram
Use the formula for \( n(A \cup B) \)
Tell at least, at most and exactly one apart
Solve surveys with x, percentages and ratios
A only: \( n_0(A) \)
Both: \( n(A \cap B) \)
B only: \( n_0(B) \)
Neither: \( n(\overline{A \cup B}) \)
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