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# Find the union of each of the following pairs of set $A=\{a,e,i,o,u\},B=\{a,b,c\}$

$\begin{array}{1 1}(A)\;\{a,b,c,e,i,o,u\}\\(B)\;\{a,e,i,o,u\}\\(C)\;\{a,b,c\}\\(D)\;\{a,a,b,c,e,i,o,u\}\end{array}$

$A\cup B=\{a,e,i,o,u\} \cup \{a,b,c\}$
$\Rightarrow \{a,b,c,e,i,o,u\}$
Hence (A) is the correct answer.