Find $\mid A _ { 1 } \cup A _ { 2 } \cup A _ { 3 } \cup A _ { 4 }|$ if each set A_i 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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The Answer of Find $\mid A _ { 1 } \cup A _ { 2 } \cup A _ { 3 } \cup A _ { 4 }|$ if each set A_i 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.

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

Find $\mid A _ { 1 } \cup A _ { 2 } \cup A _ { 3 } \cup A _ { 4 }|$