Remember the permutation formula:

_nP_r = n(n-1)(n-2)(n-3)...... ("r" times)

Paul may select any 4 digit sequence, with no digits repeated, for his locker combination. how many different sequences are there?
(Remember there are 10 possible digits)
 

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How many different ways are there to arrange the batting order for the first 3 batters on a 9 man baseball team?
 

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Mary has a problem.  You see she has 7 books but only room to display 5 on her bookshelf.  How many different 5 book arrangements can she make?
 

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There are 24 policemen in the Math City police department.  The chief wants to create 4 member squads to beef up the patrols.  How many different squads can the chief create?
 

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How many 3 letter words (spelling is not important) can be formed from the word AUTOMOBILE ?
Notice that there are 2 different "O's"
 

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