(i) Are 13 and 11 twin primes?
(ii) What is the sum of the smallest prime number and smallest composite number?

(i) Two prime numbers whose difference is 2 are called twin primes.
Difference between 13 and 11 is 13 – 11 = 2.
Therefore, 13 and 11 are twin primes.

(ii) Smallest prime number is 2.
Smallest composite number is 4.
So the sum of smallest prime and smallest composite is 2 + 4 = 6.