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Home  >>  CBSE XI  >>  Math  >>  Sets
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If $A$ and $B$ are two sets such that $A \subset B$,then what is $A\cup B$?

$\begin{array}{1 1}(A)\;A&(B)\;B\\(C)\;AB&(D)\;BA\end{array} $

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Since A is a subset of B,therefore every element of set A is contained in the set B and hence $A\cup B=B$
Hence (B) is the correct answer.
answered May 26, 2014 by sreemathi.v

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