(a) Write set A = collection of factors of 140.

(b) Write set B = collection of prime factors of 140.

(c) By considering the sets A and B obtained above, insert appropriate symbol ∊ or ∉ for each blank spaces :

(i) 1 ............ A            (ii)  1 ............ B            (iii)   7 ........... A

(iv) 14 ......... B            (v) 28 ........... A            (vi)  28 .......... B

163. Which of following sets is an empty set?

Find the pairs of equal sets, if any, giving reasons.

(i) A = {2, 3}, B = {x : x is a solution of x² + 5x + 6 = 0}

(ii) A = {x : x is a letter in the word “FOLLOW”}, B = {y : y is a letter in the word “WOLF”}

(iii) A = {x : x is multiple of 10}, B = {10, 15, 20, 25, 30 ........}

(iv) A = {2}, B = {x : x is an even prime number}

State which of the following sets is finite or infinite :

(i) The set of lines which are parallel to the x-axis.

(ii) The set of letters in the English alphabet.

(iii) The set of animals living on the earth.

(iv) The set of circles passing through the origin.

(v) The set of prime divisors of 25.

From the sets given below, select equal sets :

A = {0, a}, B = {1, 2, 3, 4}, C = {4, 8, 12}, D = {3, 1, 2, 4}, E = {1, 0}, F = {8, 4, 12} G = {x : x ∊ N and x is multiple of four and less than 13

Give examples of sets A, B, and C, such that 

Matcht the following :



                 Column A                                                  Column A

(a)              

(b) {5, 10, 15, 20, 25, ........}              


                

Which of the following sets are equal?

(a) A = {x : x is letter of the word “WOLF”}

(b) B= {x:x is letter of the word “FOLLOW”}

(c) C = {x : jc is a letter of the word “FLOWER”}

(d) D = {x : x is a letter of the word “FLOW”}