Question

You roll a die once and pick one marble out of three. how many outcomes are possible

Answer 1

we have total 18 outcomes.
they are as:
(1,R) (1,G) (1,W) (2,R) (2,G) (2,W) (3,R) (3,G) (3,W) (4,R) (4,G) (4,W) (5,R) (5,G) (5,W) (6,R) (6,G) (6,W)

Answer 2

18 Possible outcomes

For every number one the dice you can get three different marbles so its

6 x 3 + 18