Question

Find HCF of $12,20and72$ is

• A. $6$
• B. $2$
• C. $4$
• D. $12$

Answer 1

The correct option is C

$4$

Step 1. write prime factor of all.

$$\begin{gathered} 12=2\times 2\times 3 \\ 20=2\times 2\times 5 \\ 72=2\times 2\times 2\times 3\times 3 \end{gathered}$$

Step 2. find product of common factors

$$\begin{gathered} =2\times 2 \\ =4 \end{gathered}$$

HCF is $4$

Hence, option C is correct