Question

Which of the following is a pair of twin primes as well as co-primes?

• A. $15,17$
• B. $63,65$
• C. $29,31$
• D. $43,45$

Answer 1

The correct option is C

$29,31$

Prime numbers that differ by two are called twin primes.

Co-prime numbers are pairs of numbers that do not have any common factor other than $1$.

$29,31$ is the pair of twin primes because they both are prime numbers that are differ by two.

$29,31$ are Co-prime numbers are pairs of numbers that do not have any common factor other than $1$.

therefore option C is the correct answer.