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(i) 1,2,3,6 all are natural numbers and also divisors of 6. Hence,(i) matches with (c) (ii)  2,3 are prime numbers and are divisors of 6. Hence,(ii) matches with (a). (iii) M,A,T,H,E,I,C,S are letters of word "MATHEMATICS". Hence, (iii) matches with (d). (iv) 1,3,5,7,9 are odd natural numbers less than 10. Hence,(iv) matches with (b).
The consonents in english which precedes K are : B,C,D,F,G,H,J Hence, F = {B,C,D,F,G,H,J}.
The months not having 31 days are: February April June September November It can be written as {february,April,June,September,november}
LOYAL has letters L,O,Y,A. D = {x : x is a letter in the word “LOYAL”} can be written as {L,O,Y,A}.
Integers whose square is less than or equal to 4 are : -2,-1,0,1,2. Hence,it can be written as c = {-2,-1,0,1,2}.
Intergers between    are 0,1,2,3,4. Hence,B = {0,1,2,3,4}
A = { x : x is an odd natural number } = {1,3,5,7,9,11,13.............}
. . . .  can be written as
This is a set of all even natural numbers. {2,4,6....} can be written as {x : x is an even natural number}
can be written as
can be written as
A = {3,6,9,12} This can be written as :
The set of letters of word BETTER are: {B,E,T,R} This can be written as: F = {B,E,T,R}
Letters of word TRIGONOMETRY are:T,R,I,G,N,O,M,E,Y. This can be written as : E = {T,R,I,G,N,O,M,E,Y}
Prime numbers which are divisor of 60 are:2,3,5. This can be written as:
The two digit numbers having sum equal to 8 are: 17,26,35,44,53,62,71,80. This can be written as:
Natural numbers less than 6 are: 1,2,3,4,5. This can be written as:
Elements of this set are:-3,-2,-1,0,1,2,3,4,5,6. Hence ,this can be written as: A =
A =  ,the elements which lie in this set belongs to this set and others do not belong. (i) 5  A (ii) 8  A (iii) 0  A (iv) 4  A (v) 2  A (vi) 10  A
A Collection of most dangerous animal is not well defined because the criteria of defining dangerousness of any animal can vary . Hence,it is not a set.
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