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Find the union of each of the following pairs of set $A=\{x : x$ is a natural number and $1 < x\leq 6\},B=\{x : x$ is a natural number and $6 < x < 10\}$

$\begin{array}{1 1}(A)\;\{2,3,4,5,6,7\}\\(B)\;\{1,2,3,4,5,6,7,8,9\}\\(C)\;\{2,3,4,5,6,7,8,9\}\\(D)\;\{7,8,9\}\end{array} $

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$A\cup B=\{2,3,4,5,6\}\cup\{7,8,9\}$
$\Rightarrow \{2,3,4,5,6,7,8,9\}$
Hence (C) is the correct answer.
answered May 26, 2014 by sreemathi.v

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