How many elements are in the Cartesian product D x E?
D x E = {(x, y) | x element of D and y element of E}
To find the number of elements in the Cartesian product D x E, you need to multiply the number of elements in the set D by the number of elements in the set E.
If you know the number of elements in each set, you can simply multiply those numbers together to get the total number of elements in the Cartesian product.
Let's assume that the set D has 'n' elements and the set E has 'm' elements. Then, the Cartesian product D x E will have 'n * m' elements.
Therefore, to find the number of elements in the Cartesian product D x E, you need to know the number of elements in both sets D and E, and then multiply those numbers together.