 Hi, and welcome to the session. Let us discuss the following question. It states, if element A has, if set A has elements 1 and 2 and set B have element 3 and 4, write A cross B. How many subsets will A cross B have? List them. Now, first of all we should be well versed with the formula that will help us in finding out the subsets. That is, number of subsets can be find it out equal to 2 ways to the power n, where n are the number of, so this formula is the key idea that we should know in order to find out the given values. First of all, set A we will rewrite, then B is 3 comma 4. First of all, let us find out A cross B. It will be having ordered pair where the first pair will be 1 comma 3, second will be 1 comma 4, then 2 comma 3 and 2 comma 4, right? So, the number of elements in E cross B are 4. So, we can find out the number of subsets. It will be 2 raised to the power 4 that is equal to 16 subsets. So, we made use of our knowledge of this formula and it helped us in finishing off with our question. Bye.