 Hello and welcome to the session. In this session we discussed the following problem which says 25 members of a committee had came for a round table conference in how many ways can they and our president be seated. Let's understand the question. If there are 25 members in a committee who are to be seated around a circular table along with the president and we have to find the number of ways for this arrangement. We know that the number of ways in which 10 persons can form a ring is given by n-1 factorial. That is, if we have to make arrangements for n number of objects then we fix the position of one object then the remaining n-1 objects be arranged in n-1 factorial number of or we can say the number of ways in which n persons can form a ring is given by n-1 factorial. This is the key idea we shall be using in this question. Let's move on to the solution. Now in the question it is given that there are 25 members along with the president who are to be seated around a circular table. There are 25 members along with a president that is 26 persons in all to be seated. As given in the key idea we know that if we have n number of objects then we can fix the position of one object and the remaining n-1 objects can be placed in n-1 factorial number of ways. Let us desit of one person say the president then using the key idea we get that the remaining 25 members can be seated around a circular table in 25 factorial number of ways. Hence the number of ways in which the president and all 25 members will be seated is given by 25 factorial which is our final answer. This completes our question. Hope you have understood it well.