jessiegarrison1 jessiegarrison1
  • 12-07-2017
  • Mathematics
contestada

How many 5-letter passwords can be created if no letter can be used twice within the password?

Respuesta :

irspow
irspow irspow
  • 12-07-2017
26*25*24*23*22=7893600

or you can use

26!/(26-5)!=7893600
Answer Link
QueenJahaida
QueenJahaida QueenJahaida
  • 12-07-2017
If there are 5 letters used only, then 5! or 5*4*3*2 = 120
If all 26 letters of the alphabet may be used for the code, then:
26*25*24*23*22
If you mean letters of the alphabet, and not case sensitive, it's26*25*24*23*22
= 7893600
Answer Link

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