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Let $A=\{a,b\},B=\{a,b,c\}$.Is $A\subset B$?What is $A\cup B$?

$\begin{array}{1 1}(A)\;No,\{a,b,c\}&(B)\;Yes,\{a,b\}\\(C)\;Yes,\{a,b,c\}&(D)\;No,\{b,c\}\end{array} $

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Yes,$A\subset B$ because every elements of set A is also an element of set B
$A\cup B=\{a,b\} \cup \{a,b,c\}$
$\Rightarrow \{a,b,c\}$
Hence (C) is the correct answer.
answered May 26, 2014 by sreemathi.v

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