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Find the union of each of the following pairs of set $ A={1,2,3},B=\phi$

$\begin{array}{1 1}(A)\;\{1,2,3,\phi\}&(B)\;\{1,2,3\}\\(C)\;\phi&(D)\;\{1,2,3,\{\phi\}\}\end{array} $

1 Answer

$A\cup B=\{1,2,3\}\cup \phi$
$\Rightarrow \{1,2,3\}$
Hence (B) is the correct answer.
answered May 26, 2014 by sreemathi.v
 

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