If D = {w, h, y} and E = {n, o, t}then answer the following:

Question

If D = {w, h, y} and E = {n, o, t}then answer the following:
a) How many possible one-to-one correspondences are there between sets D and E?                                 (b) How many elements are in the Cartesian product D * E?

Jim · Answer

There are 9 one-to-one correspondences possible (2 sets of 3, thus 3^2)