The Least Common Multiple $(LCM)$ of the smallest prime number and the smallest composite number is ........

For any positive integer $n$,the last digit of $5^n$ is always . . . . . . .

If the $HCF(a, b) = 16$, then which of the following cannot be the $LCM(a, b)$? (Options: $32, 72, 64$)

For the decimal expansion of a rational number $\frac{p}{q}$ to be terminating,if $q = 2^m \cdot 5^n$,then $m, n \in$ . . . . . . ($R$,$N \cup \{0\}$,$Z$)

Match the following items related to the properties of numbers:

$Q.1.$ $HCF$ of $25$ and $10$	$A. 5$
$Q.2.$ $LCM$ of $17$ and $11$	$B. 187$

Check whether $4^n$ can end with the digit $0$ for any positive integer $n$.