$$\left. \begin{array} { l } { a , 3 , 18 } \\ { 27 , 48 } \\ { a } \end{array} \right.$$
$432a$
$$18=2\times 3^{2}$$ $$27=3^{3}$$ $$48=2^{4}\times 3$$
$$432a$$
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$a,\ 3,\ 18,\ 27,\ 48,\ a$
