Question

You are going out with your friends and trying to decide what to wear. You have the set of shirts and the set of bottoms below. Find A X B.

A = {red, blue, green}

B = {khaki, denim, cargo}

Answer 1

A x B is the cartesian product of A and B. It's the set of all ordered pairs, with the first coordinate in A and the second in B.
So, for example:
If A={1,2,3,4} and B={1,3,5}, what is AxB
A x B = {(1, 1), (1, 3), (1, 5), (2, 1), (2, 3), (2, 5), (3, 1), (3, 3), (3, 5), (4, 1), (4, 3), (4, 5)}

Answer 2

Hope it helps @SAm_1234