1. are 11 and 13 twin primes
Solution:
Twin prime numbers are the pair of prime numbers whose difference between two prime numbers is 2
11 is prime
13 is prime
The difference between 11 and 13 is 2
Since both 11 and 13 are prime numbers and their difference is 2.
So 11 and 13 are twin primes
2. are 3 and 5 twin primes
Solution:
Twin prime numbers are the pair of prime numbers whose difference between two prime numbers is 2
3 is prime
5 is prime
The difference between 3 and 5 is 2
Since both 3 and 5 are prime numbers and their difference is 2.
So 3 and 5 are twin primes
3. are 5 and 7 twin primes
Solution:
Twin prime numbers are the pair of prime numbers whose difference between two prime numbers is 2
5 is prime
7 is prime
The difference between 5 and 7 is 2
Since both 5 and 7 are prime numbers and their difference is 2.
So 5 and 7 are twin primes
4. are 13 and 15 twin primes
Solution:
Twin prime numbers are the pair of prime numbers whose difference between two prime numbers is 2
13 is prime
15 is not prime, because it is divisible by 3
So 13 and 15 are not twin primes
5. are 9 and 11 twin primes
Solution:
Twin prime numbers are the pair of prime numbers whose difference between two prime numbers is 2
9 is not prime, because it is divisible by 3
So 9 and 11 are not twin primes
6. are 17 and 23 twin primes
Solution:
Twin prime numbers are the pair of prime numbers whose difference between two prime numbers is 2
The difference between 17 and 23 is 6, which is not 2
So 17 and 23 are not twin primes
7. are 13 and 17 twin primes
Solution:
Twin prime numbers are the pair of prime numbers whose difference between two prime numbers is 2
The difference between 13 and 17 is 4, which is not 2
So 13 and 17 are not twin primes
This material is intended as a summary. Use your textbook for detail explanation.
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