 Hi and welcome to the session. I am Priyanka and let us proceed on with the question. It says, in a group of students, 100 students know Hindi, 15 know English and 25 know both. Each student knows either Hindi or English. How many students are there in the group? Now, let us draw a main diagram first of all to understand the situation that is given to us. Have we given that the number of students who know Hindi are 100 and number of students who know English are 50, but 25 know both these languages. That means, edge intersection E is given to us as 25. We need to find the number of students in the whole group. The knowledge of this main diagram is the key idea that will help us in proceeding on with our solution. Let edge denote the set of students who know Hindi, then number of students who know Hindi are given to us as 100. Let E denote the set of students who know English. The number of students who know English are given to us as 50. Number of students who know both Hindi and English is equal to edge intersection E, that is given to us as 25. Now, we need to think of the number of students which are present in the whole group. Now, on applying one of the properties that if we need to find the number of elements present in two groups together, we need to add the number of students in one group to the number of students in another group and subtract the number of students who are present in both the group. And we will get the answer. So, we have number of students who know Hindi as 100, number of students who know English as 50 and number of students who know both the languages as 25. So, number of students who know who are in the group will be 125. So, we can write our answer as, therefore, number of students in the group 125 students. So, this completes the entire question that was given to us. Let me tell you one more thing. If there are 100 students in the group H and there are 25 students who are common to us, obviously this will be 100 minus 25, 75 students will be purely knowing Hindi. Similarly, 50 minus 25, that is 25, 25 students will be knowing English purely. So, 75 plus 25 plus 25 will give you the total number of students in the group that is equal to 125. Right? So, with the help of wean diagram, you can assess the answer at once and then proceed on with the whole procedure. Bye for now.