 Hi and welcome to the session. I am Priyanka and I am going to help you with the following question. It says which of the following are sets? Justify your answer. So, in this question we need to tell which of the following given statements are sets and there are nine statements given to us. But before proceeding on with the solution, we should be well versed with the definition of a set. A set is a well-defined collection of objects. The knowledge of this definition is the key idea we are going to use in order to proceed on with our solution. The main thing that needs to be focused is the set should be well-defined. So, let us proceed on with our solution. Now, we will be talking about each and every statement separately. The first statement given to us is the collection of all months of a year beginning with letter J. Right? Now, can you think of the month's name which is beginning with letter J? Here, the given collection is a well-defined collection because we know that it will be a collection of January, June, July. Right? So, we have a well-defined collection of the objects and according to this definition, a set is a well-defined collection of objects which we can define. So, here in this statement we can define the answer so we can write that the given collection is a set. This completes the first part. Proceeding on with the second part, the collection of ten most talented writers of India. Right? Now, the second part given is the collection of most ten most talented writers of India. Different people may have different opinion on who are the ten best writers of India. So, that means the set will vary from one person to another. So, that we can conclude that this collection is not well-defined and hence this collection is not a set. Right? This is the answer of the second part. Proceeding on with the third part, the statement is a team of eleven best cricket batsmen of the world. Now, here also opinion about who are the best eleven batsmen of the world may vary from one person to another and hence it states that it is not defined. So, the collection is not well-defined and hence it is not a proceeding on with the fourth part, the collection of all boys in your class. Now, here we can definitely decide which boy belong to your class and which belongs to the other class. Right? So, it will not vary from one individual to another individual. Hence, the given collection is well-defined and can be stated that it is a set. Proceeding on further to the fifth part, the collection of all natural numbers less than hundred. Now, here in the fifth part, the given collection of all natural numbers less than hundred. So, we have a well-defined collection here which consists of objects that starts from one, proceed on to two, then three, then four and keeps on till ninety-nine as it is less than hundred. So, here we have a well-defined collection and therefore it can be represented that this is a set. Now, the sixth part says the collection of novels written by writer Munshi Preen Chand. Now, here this collection is well-defined because we have particular novels which are written by Munshi Preen Chand as we know who is the writer and who is not and it is not dependent on individual opinion. Right? Hence, the given collection is a set. The seventh part is the collection of all even integers. Now, in this given collection, we can definitely decide whether a given number is an even integer or not. Thus, belongs to this collection or not. Hence, the given collection is a set. So, the answer will be set as we can definitely decide by looking at the numbers whether it belongs to the set of even integers or not. Proceeding on with the eighth part, we are given the collection of questions in this chapter, the chapter which you are doing right now. Right? Now, here also we have well-defined collection since we can definitely count on to the number of questions given to us in this chapter. So, we can say that this is a set because we have well-defined answer to it. Proceeding on with the last and final part, the collection of most dangerous animals of the world. Now, here also the opinion about which animal is most dangerous vary from different people to different people in living in different countries also. So, therefore, we do not have a well-defined collection and hence the answer will be it is not a set. Wait, so this completes the entire question which was given to us. I hope you enjoyed the session and just remember that a collection is a set when we have a well-defined answer to it. Otherwise, it is not a set. Bye for now.