 Hi and welcome to the session. Let us discuss the following question. It says write the following sets in roster form. Now these are the sub-parts of the question which are given to us and we need to write them in roster form. So first of all, let us be well versed with what a roster form is all about. In a roster form, all elements of the set are listed. The elements are being separated by a commas and then they are enclosed within braces. So if we have A, B, C as the elements, they will be separated by a commas and then they will be enclosed within braces. So in all the above sub-parts we need to convert them into roster form. We need to list the elements and then enclose them into braces having a commas as their separating points. So this is the key idea that was required for us to answer the following question. Let us start with the A part. Now here we are given that X is to X is an integer minus 3 is less than equal to X is less than 7. Now here we need to list the elements. Now it is an integer that means both positive and negative numbers we have. Now it is less than equal to minus 3 that means minus 3 will also be included. Minus 3, minus 2, minus 1, 0, 1, 2, 3, 4, 5, 6. Now we will not be including 7 as X has to be less than 7. We do not have an equality sign with it. So this completes our first part. Proceeding on with the second part. Now here we are given B is equal to X is to X is a natural number less than 6. So natural numbers are one of the systems of the numbers. So we can list them. It has to be less than 6 on natural numbers. Starting number is 1. So 1, 2, 3, 4 and 5 because it has to be less than 6. This completes our second part. Moving on to the third part we have. Now this was the second part. Now here we are given X is to X is a 2 digit number, 2 digit natural number such that the sum digit is 8. Now it has to be a 2 digit natural number such that the sum of its digits is 8. So it can be first of all 80. Then it can be 71 or 17. Then it can be 62 or 26. Then it can be 53 or 35. Then it can be 44. So these can be the numbers that is we need to write 2 digit number that is why we haven't have 8 separately because that will be a single digit number. So starting from 17 reversing it simultaneously and we'll be getting all the numbers. So this ends the third part. The fourth part given to us is X is to X is prime number which divisor of 60. Now we need to think of two things over here. It has to be prime number and it should be divisor of 60. So the answer can be starting with the lowest prime number that is 2. 2 is a divisor of 60. 3 is also a divisor of 60. 5 is also a divisor of 60. The next is 7. It is not a divisor and so on. We found out that only these three numbers are the divisor of 60 that is a prime. All these are prime numbers. So the next part says the set letters in the word tricono metri. Now here we'll be listing the words closed in braces. But remember that once you have written an element it will not get repeated. So it will be trigon and o we will not be repeating it. m, e, d we have already written, r we have already written so we are left with y. So this ends the fifth part. Proceeding on with the last and final part. Now here we are given the set of all letters in the word better. Our answer will be t is again coming, e is again coming and r. So this completes the question that was given to us. I hope you enjoyed the session and now know that which form is said to be a roaster form and which form is said to be a set builder form. So good luck.