The answer is 336.
Sol'n:
8P3 = 336 ways
where P = permutation
We use Permutation rather than Combination.
In the problem, it asks for the outcome or ways. Pablo picked 3 marbles over the eight marbles but it didn't mention if he picked a yellow, green, or red marble. In this state, you are going to assume that he picked random color of marbles. In that case, you are going to use Permutation.
