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Answer variants:
121,119,118,17
119,118
122,121,120,17,18,19
122,121,17,19
120,119,118,18
122,120,18,19
If U = 122,121,120,119,118,17,18,19, X = 120,119,118,18 and Y =121,119,118,17, then prove that (X \cap Y)^{\prime} = X^{\prime} \cup Y^{\prime}
 
X \cap Y =
(X \cap Y)^{\prime} =
 
X^{\prime} =
Y^{\prime} =
 
X^{\prime} \cup Y^{\prime} =