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Question

At what condition |A U B|= |A| + |B|?


Solution

The equation is
|A ∪ B| = |A| + |B| – |A ∩ B|
So,|A ∪ B| = |A| + |B| Then
|A ∩ B| Should be zero 
that is |A ∩ B| =0

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