Question

The least common multiple of 9, 18, 57 and 12 is _____.

• A. 228
• B. 684
• C. 36
• D. 114

Answer 1

The correct option is B 684

$\begin{array}{cc}3& 9,18,57,12\\ 3& 3,6,19,4\\ 2& 1,2,19,4\\ 2& 1,1,19,2\\ 19& 1,1,19,1\\ & 1,1,1,1\end{array}\text{LCM}=3\times 3\times 2\times 2\times 19=684$