Question 1179590: Walter’s family has just arrived at Disney World’s Magic Kingdom! They all want to go on the Train, Splash Mountain, Pirates of the Caribbean, and It’s a Small World. How many combinations can they use to go on these four rides?
Found 2 solutions by ikleyn, greenestamps:
Answer by ikleyn(52776)   (Show Source):
You can put this solution on YOUR website! .
The total number of combinations that can be made from 4 items, is  = 16, including the empty set.
If to exclude the empty combination, then the answer will be  = 16-1 = 15.
Solved, answered and explained.
Answer by greenestamps(13198)  (Show Source):
You can put this solution on YOUR website!
The meaning of the question is unclear: "how many combinations CAN THEY USE..."
????
Re-post, finding a better way to pose the question.
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Note the other tutor interpreted the question as being the number of combinations of the 4 rides they can go on, allowing the possibility that the number of rides they go on can be 0, 1, 2, 3, or all 4.
I suppose that is a possible interpretation; however, the wording to me says that the family wants to go on ALL FOUR of the rides.
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