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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}.
A = { x : x is an odd natural number } = {1,3,5,7,9,11,13.............}
This is a set of all even natural numbers. {2,4,6....} can be written as {x : x is an even natural number}
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.