SOLUTION: Carl is choosing a four-character password for his cell phone. The password can contain letters and digits only, and can't include repeating characters. How many passwords are

Question 1139436: Carl is choosing a four-character password for his cell phone. The password can contain letters
and digits only, and can't include repeating
characters. How many passwords are possible?

Answer by ikleyn(52778) (Show Source): You can put this solution on YOUR website!
.


In all, Carl can use 26 + 10 = 36 symbols.


Without repeating, there are  36*35*34*33 = 1413720 different possible codes.



Any of 36 symbols in the very first leftmost position;

then any of 35 remaining symbols in the 2-nd position;


    . . .  and  so  on  . . .

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