Question

Find the common factor of $18$ and $39.$

• A. $18$
• B. $6$
• C. $3$
• D. $13$

Answer 1

The correct option is C $3$

We know,
$18=1\times 6\times 3$
$18=1\times 2\times 9$

$\therefore$ Factors of $18$ are $1,2,3,6,9$ and $18.$

$39=1\times 3\times 13$

$\therefore$ Factors of $39$ are $1,3,13$ and $39.$

Hence, the common factor is $3.$