Which of the following is NOT a set?
The collection of all even numbers
The collection of all prime numbers less than 50
The collection of all good singers in India
The set of vowels in the English alphabet
(3) The collection of all good singers in India (It is not well-defined)
A set containing only one element is called a:
Empty set
Finite set
Singleton set
Infinite set
(3) Singleton set
The set containing no elements is called:
Universal set
Empty set
Finite set
Singleton set
(2) Empty set
