 Hi and welcome to the session. I am Priyanka and let us discuss the question together. It says if the set A has three elements and set B has elements that are 3, 4, 5, then find the number of elements in A cross B. Here in this question we will use that if there are P elements in set A and Q elements in set P, then the number of elements in A cross B will be P into Q. That is, if the number of elements in set A is equal to P and number of elements in set B is equal to Q, then number of elements in A cross B is equal to P cross P into Q. Right, so in this question it is given that set A has three elements and the knowledge of the number of, how will we find the number of elements is the key idea we are proceeding with our solution. Now here it is given that A has three elements and set B has elements that are 3, 4, 5. So, number of elements in set A is equal to 3 and number of elements in set B is equal to 3 again. In this question we need to find the number of elements in A cross B that will be 3 multiplied by 3 that is 9. So, the answer will be the number of elements in A cross B is 9. Right, so for solving the given problem we use the fact that number of elements in A cross B is the product of number of elements in set A and the number of elements in set B and found out the required answer that is number of elements in A cross B. So, I hope you enjoyed the session. Take care of your calculations. Bye for now.