In this picture showing about grade 9’s favorite genre of music between Rock music and Pop music. Most of grade 9 students choose pop music than rock music. Venn diagram is used to show the result of the survey. A set in mathematics is a collection of well defined and distinct objects, considered as an object in its own right. Sets are one of the most fundamental concepts in mathematics. For me this subject is easy because the lessons is not complicated and the teacher explains in a good way.