MathDiscrete mathCombinatorics

Inclusion–exclusion principle

Two sets

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What can you calculate knowing the number of elements in the set $A$ and the number of elements in the set $B$ ?

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|A \cup B|

regardless of whether

A

and

B

are disjoint

|A \cap B|

only if

A

and

B

are disjoint

|A \cup B|

only if

A

and

B

are disjoint

|A \cap B|

regardless of whether

A

and

B

are disjoint

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