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

Find the largest number that divides $2053$ and $967$ and leaves a remainder of $5$ and $7$ respectively.

If $p$ and $q$ are distinct prime integers,then their $LCM$ will be ...........

For any two positive integers $a$ and $b$,what is the relationship between their $HCF$ and $LCM$? $\text{HCF}(a, b) \times \text{LCM}(a, b) = \text{?}$

Find the $HCF(156, 455)$.

Find the $HCF$ of $12$,$15$,and $21$.