Respuesta :

irspow
26*25*24*23*22=7893600

or you can use

26!/(26-5)!=7893600
QueenJahaida
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