Which of the following are sets?
(i) The collection of amazing persons in the world
(ii) The collection of all the composite numbers
(iii) The collection of all letters of the word INDIAN
(iv) The collection of all factors of 32.

Answer

(i) Amazing person cannot be decided particularly
(ii) Composite number have more than two factors.
(iii) Letters are I,N,D,A
(iv) Factors of 32 are 1,2,4,8,16,32.

Explanation

(ii),(iii),(iv) are sets.