Which of the following are Twin primes?
21 , 23
59 , 61
61 , 63
67 , 69

Given :

The given pairs of numbers are, [21,23] , [59,61] , [61,63] , [67,69]

To find :

We have to find which are win primes among the given pairs of numbers.

Solution :

Twin Primes:

Two prime numbers whose difference is two are called twin primes.

(21,23) are twin primes, since the difference between the two numbers $23 – 21 =2$.

(59,61) are twin primes, since the difference between the two numbers $61 – 59 = 2$.

63 is not a prime number.

69 is not a prime number. 

Therefore, [21,23] and [59,61] are twin primes.

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Updated on: 10-Oct-2022

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