Let X and Y be two non-empty sets such that \[X\cap A=Y\cap A=\phi \] and \[X\cup A=Y\cup A\]for some non-empty set A. Then

Let X and Y be two non-empty sets such that \[X\cap A=Y\cap A=\phi \]

1.	Let X and Y be two non-empty sets such that \[X\cap A=Y\cap A=\phi \] and \[X\cup A=Y\cup A\]for some non-empty set A. Then
A.	X is a proper subset of Y
B.	Y is a proper subset of X
C.	X = Y
D.	X and Y are disjoint sets
Answer» D. X and Y are disjoint sets

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Let X and Y be two non-empty sets such that \[X\cap A=Y\cap A=\phi \] and \[X\cup A=Y\cup A\]for some non-empty set A. Then

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