Question

Which of the following is not a factor of 15?

• A. 1
• B. 3
• C. 6
• D. 15

Answer 1

The correct option is C 6

$15=1\times 15$
$15=3\times 5$

Hence, the factors of 15 are 1, 3, 5 and 15.

So, among the given options, 6 is not a factor of 15.