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# If $A=\{1,2,3,4\},B=\{3,4,5,6\},C=\{5,6,7,8\}$ and $D=\{7,8,9,10\}$ Find $A\cup C$

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

$A=\{1,2,3,4\}$
$C=\{5,6,7,8\}$
$A\cup C=\{1,2,3,4\} \cup \{5,6,7,8\}$
$A\cup C=\{1,2,3,4,5,6,7,8\}$
Hence (A) is the correct answer.