Question

Question 24

The common factor of $3ab$ and $2cd$ is
a) 1
b) -2
c) a
d) c

Answer 1

a) 1
$\to$​​​​​​​We have, monomials $3ab$ and $2cd$
Now, $3ab=3\times a\times b$
$2cd=2\times c\times d$
Observing the monomials, we see that, there is no common factor (neither numerical nor literal) between them except 1.