1.3 Permutations Involving Identical Elements
What is 0! equal?
What does 
equal?
Ex 1 How many permutations of the letters in the word ROAM are there?
Ex 2 How many permutations of the letters in the word
Ex 3 How many permutations of the letters in the word RORO are there?
The number of permutations of n objects, of which a
objects are identical, another b
objects are identical, another c
objects are identical, etc. is 
Ex 4 How many permutations of the letters in the word MINIMUM are there?
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