A discrete mathematics problem by Bilal Akmal

\( A=\left\{ x:2\quad is\quad a\quad factor\quad of\quad x \right\} \\ B=\left\{ x:3\quad is\quad a\quad factor\quad of\quad x \right\} \\ C=\left\{ x:5\quad is\quad a\quad factor\quad of\quad x \right\} \)

What is the smallest positive integer which is a member of \( \left\{ { A }'\bigcap { B' } \right\} \bigcup { C } \) but is not a member of \( A'\bigcap { \left\{ B'\bigcup { C } \right\} } \)?

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