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A = set of even integer numbers.
B = set of odd integers.
C = prime number set
D = integers which are multiples of 3.

A - B  = A - A Π B = A
       as  A and B are disjoint sets.    A Π  B  = null set φ

B - A  = B  as    same reason as above.

A  U B = I or Z = set of all integers , as an integer is either even or odd.
A U B =  {x : X is an even integer or an odd integer }
           = { x : x is an integer }

A Π B = {x : x is an odd integer and an even integer }
           = φ  null set.

1 5 1
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