 Hello and welcome to the session. In this session, we will discuss the following question and the question says, write the following sets in description form. First part, a Socialist Triangle, Equilateral Triangle, Skinny Triangle. Second part, 1, 2, 3, 6, 7, 13, 21, 32, 3, 4, 5, 6, 7, 8, 9. Before we start solving the question, let us first recall what is description form of a set. In this form, we write the description of the members of the set stating the common property of the set. So, this is a key idea for this question and using this key idea, we will solve the question. Let's start the solution now. In part 1, we have a Socialist Triangle, Equilateral Triangle and Skinny Triangle. These are types of triangles based on sides. Now, we have to write the set in description form. That is, we will write the description of the members of the set stating the common property of the set. Now, the common property between these three elements is that there are types of triangles based on sides. So, the given set can be written in description form as set A is equal to the set containing types of triangles based on sides. So, then this is. So, this is our answer for part 1. In part 2, we have the numbers 1, 2, 3, 6, 7, 14, 21, 42. Now, we can see that 1 into 32 is equal to 42. 2 into 21 is equal to 42. 3 into 14 is equal to 42 and 6 into 7 is equal to 42. So, we can see that all these numbers are factors of 42. That is, all these numbers are factors of 42. So, the common property between all these numbers is that they are factors of 42. So, the given set can be written in description form as set B is equal to the set containing all factors of 42. This is our answer for part 2. Now, in part 3, we have the numbers 4, 5, 6, 7, 8, 9. Now, all these numbers lie between 3 and 10. That is, all these numbers are greater than 3 and less than 10. So, this is the common property between all these elements. So, the given set can be written in description form as set C is equal to the set containing all numbers lying between 3 and 10. This is our answer for part 3 and with this we end our session. Hope you enjoyed the session. Thank you.