Union of Three Sets
If you couldn't catch it, the formula is: n(A ∪ B ∪ C) = n(A) + n(B) + n(C) − n(A ∩ B) − n(A ∩ C) − n(B ∩ C) + n(A ∩ B ∩ C)
The whole thing is better explained in this video: • 67 General formula for computing number of...
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