I understand the thread about multiplying the two sets together

{1, 2} x {3, 4} = {(1, 3), (1, 4), (2, 3), (2, 4)}

but what if there's another set?

A x B x C = ???

if it were:

{1, 2} x {3, 4} x {5, 6}

how do these sets come together to give the cartesian product?