A word is an ordered, non-empty sequence of letters, such as word or wrod. How many distinct 3-letter words can be made from a subset of the letters c, o, m, b, o, where each letter in the list is used no more than the number of times it appears?
A word is an ordered, non-empty sequence of letters, such as word or wrod. How many distinct 3-letter words can be made from a subset of the letters c, o, m, b, o, where each letter in the list is used no more than the number of times it appears?