If A = {1,2}, B = {1,3), then (A x B) U (B x A) is equal to:
a. {(1,3), (2,3), (3, 1), (3, 2) (1, 1), (2, 1), (1, 2)}
b. {(1, 3), (3, 1), (3, 2), (2,3)}
c. {(1,3), (2, 3), (3, 1), (3, 2) (1, 1)}
d. None of the above
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this question's answer is option A
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