 Hi and welcome to the session. I am Asha and I am going to help you with the following question which says, consider two postulates given below. First, given any two distinct points A and B, there exist a third point C which is in between A and B. Second is, there exist at least three points that are not on the same line. Do these postulates contain any undefined terms? Are these postulates consistent? Do they follow from Euclid's postulates? Explain. So, let us now begin with the solution and the question says, do these postulates contain any undefined terms? There are several undefined terms which the student should list. Second part says, are these postulates consistent? They are consistent because they deal with two different situations. First says, in a given two points A and B, there is a point C lying on the line in between them and second says that given points A and B, you can take C not lying on the line through A and B. The postulates do not follow from Euclid's postulates. However, they follow from its own 5.1 of your book which says, there is a unique line that passes through two distinct points. So, this completes the session. Hope you enjoyed it. Take care and bye for now.