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Give two examples of each of the following : 

(i) Null set 

(ii) Finite set 

(iii) Infinite set 

(iv) Universal set

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(i) Null Set 

(a) A = {x : x is a natural number less than 1} 

(b) B = {x : x is a positive natural number which lies between 2 and 3} 

(ii) Finite set 

(a) A = {x : x2 < 10, where x is a prime number} 

(b) B = {x : x, is any month of a year} 

(iii) Infinite set 

(a) P = {x : x = 2n, where n is a natural number} 

(b) Q = {x : x = p/q, where p and q are integer and q ≠ 0} 

(iv) Universal set 

(a) Set of integers for natural numbers. 

(b) Set of real numbers for natural numbers, integers and rational numbers.

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