5 ms·
uh, where'd you get 24? how about 10 X 9 X 8 X 7 = 5040 combinations.
by mikesun 14y ago
uh, where'd you get 24? how about 10 X 9 X 8 X 7 = 5040 combinations.
- mappu 14y ago>I've actually encountered keypads where the order didn't actually matter If the order really doesn't matter, then that counts combinations twice (1234, 1243..). There are 10000 possible 4-digit codes, 5040 permutations, and actually 210 combinations.
- rogerbinns 14y agoYou haven't taken into account that by looking at the keypad you can tell which digits are actually used.
- rogerbinns 14y agoBecause from fingerprints and similar gunk on the pad you can tell which 4 digits were used.