Question

Two numbers having _____ as the only common factor are called ________ numbers.

• A. 2, twin prime
• B. 2, co-prime
• C. 1, co-prime
• D. 1, twin prime

Answer 1

The correct option is C

1, co-prime

Two numbers having 1 as the only common factor are called co-prime numbers.

For example, 16 and 35 are co-prime number.
Factors of 16: 1, 2, 4, 8, 16
Factors of 35: 1, 5, 7, 35
Here, 1 is the only common factor.