When we are using the Venn diagram , we use -x when we don't know the students who participated in a particular subject . And here you are telling me to use +x .How do I go about it
In a Venn diagram, we typically use +x to represent the students who participated in a particular subject and -x for the students who did not participate.
If you do not know the exact number of students who participated in a certain subject, you can estimate or use a variable to represent it. For example, if you are asked to calculate the number of students who participated in Math but not Science, and you do not have this information, you can represent it as +x (participated in Math) and -y (did not participate in Science), where x and y are variables representing the unknown quantities.
Remember, Venn diagrams are visual representations used to organize information and analyze relationships between different sets or groups. The precise numbers or variables you use will depend on the specific problem or scenario you are working on.