If the $\mathrm{LCM}$ of $a$ and $18$ is $36$ and the $\mathrm{HCF}$ of $a$ and $18$ is $2$, then $a=$

The decimal expansion of the rational number $\frac{14587}{1250}$ will terminate after

Which of the following rational numbers have terminating decimal?

$\left(\mathrm{i}\right) \frac{16}{25} \left(\mathrm{ii}\right)\frac{5}{18} \left(\mathrm{iii}\right)\frac{2}{21} \left(\mathrm{iv}\right)\frac{7}{250}$