What is the HCF of $2^4 \times 3^2 \times 5$, $2^2 \times 3^3 \times 7$ and $2^3 \times 3 \times 5^2$?

Explanation

1. 01

   Only 2 and 3 appear in all three numbers.

2. 02

   Lowest powers: $2^2$ and $3^1$.

3. 03

   $\operatorname{HCF} = 4 \times 3 = 12$.