The Mississippi Counting Problems
Problem 1
How many total arrangements of the letters in MISSISSIPPI are there?
Problem 2
How many arrangements of the letters in MISSISSIPPI exist such that the 2 P’s are separated?
Problem 3
How many arrangements of the letters in MISSISSIPPI have at least 2 adjacent S’s?
Note:
If you need a review of the basics, check out this intro to combinatorics post: