Door Lock
by Dan Meyer
skips
questions

January 08, 2012
How long would it take you to enter the right combination if you just punched in combinations randomly?
Sequel


How many guesses would it take (using 1,2,9,0) to get the correct code?

How many combinations must be tried using the four highlighted numbers, in order to find the correct combination?



How many combinations do I need to check assuming it's a 4digit code and the numbers used are 1, 2, and 9?



How many different four sequence codes are there if you can press more than one button at a time? Eg a code might be 12739028

Why are 1, 2, 9, and 0 different colors? If the code is only with 1, 2, 9, and 0 how long would it take to try all combos and break in?



What is the combination... and how many tries would it take me to guess it?













How many different combinations are there, if digits cannot be repeated?



How many different 4digit combinations would I have to try to get it correct? What if the combination has 5 digits? 6?




How many possible entries are there with those 4 numbers? How many numbers are needed?


How many combinations are possible with these 4 numbers? (reminds me of National Treasure and "valley forge")




What combination opens the door? Also, how do you reveal the fingerprints? Also, is my apartment secure?



How long could you expect to spend before you chose the right combination?


What if you noticed that there were fingerprints on only the 5,8,9, and 0 & you know that the combo is 5 digits long? How long to crack it?







How many attempts at the door code would it take to guess the actual door code?



How long would it take someone to break into your house trying one combination every second if the combo was 1,2,3,4, or 5 numbers long?













How many 4digit combinations are possible? But that's 10,000, right? Hmmm...






If you're lock is a 4digit code, how many possible codes are there? What if you couldn't repeat numbers?
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