Question

If A = {1, 2, 3, 4}, B = {2, 5}, and C = {3, 4, 7}, determine A X B; B X A; A ∪ (B X C); (A ∪ B) X C; (A X C) ∪ (B X C).

Answer 1

consider the X operation is distribution of A over B

AxB = (1,2,3,4)x(2,5) = (1,2),(1,5),(2,2),(2,5) ...

Answer 2

the u and n parts should be self explanatory by now i beleive