Find the $HCF(156, 455)$.

Find the $HCF$ and $LCM$ of the following pair of integers $510$ and $92$ and verify that $HCF \times LCM = \text{product of the two numbers}$.

The product of two consecutive positive integers is always divisible by which of the following?

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

Find the $HCF$ and $LCM$ of the integers $12$,$15$,and $21$ by the prime factorization method.

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