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# Find the union of each of the following pairs of set $A=\{x : x$ is a natural number and multiple of $3 \},B=\{x : x$ is a natural number less than $6\}$

$\begin{array}{1 1}(A)\;\{1,2,3,4,5,6\}\\(B)\;\{3,6,9\}\\(C)\;\{3,9,81...\}\\(D)\;\{1,2,3,4,5,6,12,15.....\}\end{array}$

$A=\{3,6,9,12........\}$
$B=\{1,2,3,4,5\}$
$A\cup B=\{1,2,3,4,5,6,9,12,15......\}$
Hence (D) is the correct answer.