Let \( \mathrm{A}=\{3,6,12,15,18,21\}, \mathrm{B}=\{4,8,12,16,20\} \) and \( \mathrm{C}=\{2,4,6,...

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Let \( \mathrm{A}=\{3,6,12,15,18,21\}, \mathrm{B}=\{4,8,12,16,20\} \) and \( \mathrm{C}=\{2,4,6,8,10,12,14,16\} \). Find \( A-C \)
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