 Hello and welcome to the session. In this session we discussed the following question which says, state whether the following pairs of sets are equal or not. In the first part, we have a set A equal to x such that x is a letter of the word follow and we have a set B equal to x such that x is a letter of the word wolf. Then in the second part, we have another pair of sets in which we have set C equal to x such that x square equal to 4 where x belongs to N and set D is equal to single term minus 2. First of all, let's define the equal sets. We have the sets containing the same elements are called equal sets. This is the key idea that we use for this question. Let's proceed with the solution now. In the first part, we have a pair of sets in which we have set A equal to x such that x is a letter of the word follow. So now we can list the elements of the set A. Now since repetition is not allowed in listing the elements of the set, so we would write the letter L only once though it is repeated in the word follow. So the elements of the set A would be F, O, L, W. Also we would write the letter O only once though it is repeated in the word follow. So we have got the set A. Now we have set B is equal to x such that x is a letter of the word wolf. Now we list the elements of the set B. B is equal to the set containing the elements W, O, L, F. Now as you can see that both the sets A and B contain the same elements. That is as the sets A and B contain the same elements W, O, L, F. So the sets A and B are equal sets. Thus we write set A is equal to set B in this way. The next part we have set C is equal to x such that x square is equal to 4 and x belongs to n. That is the set of natural numbers. Now since we have x square equal to 4, this means that x is equal to plus minus 2 but we would take x equal to 2 since minus 2 does not belong to n. That is the set of natural numbers. So therefore we have set C is equal to single term 2. And we are given the set D equal to single term minus 2. Now since these two sets does not contain the same elements. That is sets C and D does not contain the same elements. Therefore the sets C and D are not equal sets. That is C is not equal to D. So this completes the session. Hope you have understood the solution of this question.