Which of the following is a correct representation of inclusion exclusion principle (|A,B| represents intersection of sets A,B)?
A. |A U B|=|A|+|B|-|A,B|
B. |A,B|=|A|+|B|-|A U B|
C. |A U B|=|A|+|B|+|A,B|
D. |A,B|=|A|+|B|+|A U B|
Answer: Option A
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