A) X
B) Y
C) \[\phi \]
D) None of these.
Correct Answer: C
Solution :
\[X\cap {{(X\cup Y)}^{c}}=X\cap ({{X}^{c}}\cap {{Y}^{c}})=(X\cap {{X}^{c}})\cap {{Y}^{c}}\] \[=\phi \cap {{Y}^{c}}=\phi \]
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