How many four-character alpha-numeric codes are possible if repeated characters are not allowed?

Question

asked Nov 11, 2022 138k views

1 Answer

Piotr Falkowski · Answer 1 · 2022-11-18T08:02:19+0000

Answer:

1,413,720

Explanation:

Total number of characters = letters + numbers

= 26 + 10

= 36.

So total number of possible codes

= 36P4

= 36!/ (36-4)!

= 36*35*34*33

= 1413720