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Find ∣A1∪A2∪A3∪A4∣\mid A _ { 1 } \cup A _ { 2 } \cup A _ { 3 } \cup A _ { 4 }|

Question 121

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Find ∣A1∪A2∪A3∪A4∣\mid A _ { 1 } \cup A _ { 2 } \cup A _ { 3 } \cup A _ { 4 }| if each set Ai has 100 elements, each intersection of two sets has 60 elements, each intersection of three sets has 20 elements, and there are 10 elements in all four sets.

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