Question

Which of the following is not a common factor of 34 and 68?

• A. 2
• B. 17
• C. 34
• D. 4

Answer 1

The correct option is D 4

Let us write the factors of 34 and 68.

Factors of 34 are:


Factors of 68 are:


Let us find the common factors first using a Venn diagram.


Observing both the images, we find the common factors are 1, 2, 17, and 34.
Factors which are not common are 4 and 68.

So, out of the given options, only the fourth option is the correct one.