To find the answer you multiply 2 with 3 to find the total number of combinations.
2 X 3 = 6
So there are 6 combinations.
However, the question asks for a list of all the combinations.
So we simply list them.
--- Red shorts
Sneakers --- Blue shorts
--- White shorts
--- Red shorts
Sandals --- Blue shorts
--- White shorts
Sneakers and red shorts.
Sneakers and blue shorts.
Sneakers and white shorts.
Sandals and red shorts.
Sandals and blue shorts.
Sandals and white shorts.
So there is your list. :)