A soda fountain offers lemon iced tea, lemonade, root beer, ginger ale, and orange soda. In how many different orders can the drinks be arranged in the fountain?
Question
A soda fountain offers lemon iced tea, lemonade, root beer, ginger ale, and orange soda. In how many different orders can the drinks be arranged in the fountain?
Solution
This is a permutation problem. Permutations are the various ways in which objects from a set may be selected, generally without replacement, to form subsets. This selection of subsets is called a permutation when the order of selection is a factor.
Here, we have 5 different drinks and we want to know how many different ways we can arrange these 5 drinks.
The formula for permutations is:
P(n, r) = n! / (n-r)!
where:
- n is the total number of items,
- r is the number of items to choose,
- "!" denotes factorial, which means multiplying all positive integers up to that number.
In this case, both n and r are 5 (since we are arranging all 5 drinks), so the formula simplifies to n!, which is just 5!.
So, we calculate 5! = 54321 = 120.
Therefore, there are 120 different ways the drinks can be arranged in the fountain.
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