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Compare the elements of A,B,C,D,E,F,G,H. 8  A but  Now, 2 A  but 2C. Hence, AB,AC,AD,AE,AF,AG,AH. 3  B,3D but 3C,3 E,3F,3G,3H. Hence,BC,BE,BF,BG,BH. Similarly,comparing other elements of all sets , we conclude that elements of B and elements of D are equal  also elements of E and G are equal. Hencw, B=D  and E = G.   
Letters of word FOLLOW are F,OL,W. SO, A = {F,O,L,W} Letters of word WOLF are W,O,L,F. So, B = {W,O,L,F} Comparing A and B ,we conclude that elements of A are equal to elements of B. Hence, A=B.
As given, A = {2,3} And, x = -2 and -3 B = {-2,-3} Comparing elements of A and B,we conclude elements of A and B are not equal. Hence,AB.
Multiples of 10 are : 10,20,30,40,........ till infinite. SO, A = {10,20,30,40,.........} B = {10,15,20,25,30........} Comparing elements of A and B,we conclude that elements of A and B are not equal. Hence, A B.
Positive even integers less than or equal to 10 are : 2,4,6,8,10. So, B  = { 2,4,6,8,10 } which is equal to A = {2,4,6,8,10} Hence, A = B.
12 belongs A but 12 does not belong to B 12  A but 12  B.  Hence, A  B.
Given A = {a,b,c,d} B = {d,c,b,a} Comparing the elements of set A and set B, we conclude that all the elements of  A and all the elements of B are equal. Hence, A = B.
(i) Lines parallel to the x-axis are infinite. Hence, it is an infinite set. (ii) Letters in English alphabets are 26 letters which are finite. Hence, it is a finite set. (iii) Numbers which are multiple of 5 has no limit, they are infinite. Hence, it is an infinite set. (iv) Animals living on earth are finite though the number is very high. Hence, it is a finite set. (v) There is an infinite...
(i) Number of months in a year are 12 and finite.    Hence,this set is finite. (ii) {1,2,3,4.......} and so on ,this does not have any limit. Hence, this is infinite set. (iii) {1,2,3,4,5......100} has finite numbers. Hence ,this is finite set. (iv) Positive integers greater than 100 has no limit. Hence,it is infinite set. (v) Prime numbers less than 99 are finite ,known numbers. Hence,it is finite set.
Parallel lines do not intersect so they do not have any common point. Hence, it is a null set.
No number exists which is less than 5 and more than 7. Hence, this is a null set.
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