Given x = {15, 22, 33, 44, 89, 165, 1025} and y = {-5, 15, 33, 88, 99, 150, 160, 1025}, which of the following statements is false?
a: x u y = {-5, 15, 22, 33, 44, 89, 99, 150, 160, 165, 1025}
b: x ∩ y = {15, 33, 1025}
c: ø c (x y)

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