# S Chand ICSE Mathematics Class 6 Solution Fourth Chapter Sets Exercise 4A (O.P. Malhotra,  S.K. Gupta, Anubhuti Gangal)

EXERCISE 4A

Which of the following collections are sets? If not a set, give reasons.

(1) Planets in our solar system are well defined and so is a set.

(2) Intersecting books in the library are not well defined because intersecting books are not there in a whole number of library books. Hence, the collection is not a set.

(3) Colours of a rainbow are well defined and so is a set.

(4) All difficult problems in your Maths book are not well defined because all problems of math books are not difficult. Hence, the collection is not a set.

(5) Top five wicket takers in Test Cricket are well defined and so is a set.

(6) Intelligent boys of your class are not well defined because in the class all boys are not intelligent. Hence, the collection is not a set.

(7) Presidents of India are well defined and so is a set.

(8) Goods football players are not well defined because all football players are not also good. Hence, the collection is not a set.

(9) Counting numbers between 30 and 40 are well defined and so is a set.

(10) All good schools of India are not well defined because there are in India all schools are not also good. Hence, the collection is not a set.

(11) All vowels are well defined and so is a set.

(12) All yellow fruits are well defined and so is a set.