Hi,

password containing six numerals to be able to use the site: 

no digit may be used more than once. How many passwords are allowed 

 10*9*8*7*6*5 = 151,200



Note: 10P6 is the same as the above(using permutation as order is important)

      10P6 = 10!/(10-6)! = 10!/4! = 10*9*8*7*6*5 

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