Question

Which of the following is not a common divisor of 50 and 75?

• A. 5
• B. 25
• C. 15
• D. None of these

Answer 1

The correct option is C 15

To solve this problem, first we have to break down the numbers into their prime factors.

The prime factorization of 50 is:
2 × 5 × 5
The prime factorization of 75 is:
3 × 5 × 5

Thus, the common divisors are :
5 and 5 × 5.

Additionally, the greatest common factor is 25.

Hence, 15 is not a common divisor.