Question

Which pair of numbers are Twin prime?

• A. $2and3$
• B. $3and7$
• C. $19and21$
• D. $11and13$

Answer 1

The correct option is D

$11and13$

Twin prime- pair of prime number with difference of two called twin prime.

$2and3$ both are prime but difference is not 2

$3and7$ both are prime but difference is not 2

$19and21$ both are not prime

$11and13$ are prime and difference is 2.

Hence, option 4 is correct.