Question

Which of the following sets are empty sets?

Options

• Set of intersecting points of parallel lines.

• Set of even prime numbers.

• Month of an English calendar having less than 30 days.

• P = {x | x ∈ I, -1 < x < 1} 

Answer 1

Set of intersecting points of parallel lines.

Explanation:

Since, 

the set of intersecting points of parallel lines = {};

the set of even prime numbers = {2};

the Month of an English calendar having less than 30 days = {February}; and

P = {x | x ∈ I, -1 <  x < 1} = {0}