CUSAT 2018 BTech Solved Paper

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Question : 103 of 250

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Which of the following is not correct?

A⊆A′ if and only if A=φ
A′⊆A if and only if A=X, where X is the universal set
If A∪B=A∪C, then B=C
B=C if and only if A∪B=A∪C and A∩B=A∩C

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