Answer:
6
Explanation:
***If choosing one of each, this is the answer*** This wasn't clearly asked for in the question though
When counting the number of arrangements of multiple choices, multiply the number of choices of each item together.
(3)(2)(1) = 6
Here is them listed..
Green ball 1, red ball 1, white ball
Green ball 1, red ball 2, white ball
Green ball 2, red ball 1, white ball
Green ball 2, red ball 2, white ball
Green ball 3, red ball 1, white ball
Green ball 3, red ball 2, white ball