Question

The common factor of 3ab and 2cd is

• A. $1$
• B. $-1$
• C. $a$
• D. $c$

Answer 1

The correct option is A

$1$

Common factors are defined as factors that are common to two or more numbers. In other words, a common factor is a number with which a set of two or more numbers will be divided exactly.

The given factors can be written as;

$$\begin{gathered} 3ab=1\times 3\times a\times b \\ 2cd=1\times 2\times c\times d \end{gathered}$$

Considering the two monomials $3ab$ and $2cb$ there is no common factor except $1$.

Hence,correct option is (A).