If A = {prime numbers between 19 and 23}, then A is
A singleton set
A null set
An infinite set
None of the above
If A is the set of prime numbers between 5 and 11, then set A is
If A = {Prime numbers between 19 and 23}, then A is __________.
If A = {set of prime numbers}, then A is _____.
If A = {set of even prime numbers}, then A is