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# For subsets A, B of a set X defined A $\times$ B as A $\times$ B = (A $\cap$ B) $\cup$ (X – A) $\cap$ (X – B), mark in Venn diagram Find X - B

((X – A) $\cap$ (X – B)) = (A $\cup$ B)$^C$
A $\times$ B = (A $\cap$ B) $\cup$ ((X – A) $\cap$ (X – B))
= $\cup$