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4. Find the number of elements in the union of 4 sets A, B, C and D having 150, 180, 210 and 240 elements respectively.

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4. Find the number of elements in the union of 4 sets A, B, C and D having 150, 180, 210 and 240 elements respectively. Given that each pair of sets has 15 elements in common. Each triple of sets has 3 elements and An B n C n D = 0 5. Let A = [-2, 6), B = (-5, 3), C =[-1, 8]. Find AU (B' UC)

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