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wu :: forums    riddles    easy (Moderators: ThudnBlunder, william wu, Icarus, SMQ, Grimbal, towr, Eigenray)    Safe combination « Previous topic | Next topic » Pages: 1  Reply Notify of replies Send Topic Print    Author  Topic: Safe combination  (Read 1001 times) maryl Guest Safe combination   « on: Jul 13th, 2003, 2:31pm » Quote Modify Remove You are to open a safe without knowing the combination. Beginning with the dial set at     zero, the dial must be turned counter-clockwise to the first combination number, (then     clockwise back to zero), and clockwise to the second combination number, (then     counter-clockwise back to zero), and counter-clockwise again to the third and final     number, where upon the door shall immediately spring open. There are 40 numbers on     the dial, including the zero.          Without knowing the combination numbers, what is the maximum number of trials      required to open the safe (one trial equals one attempt to dial a full three-number      combination)? IP Logged BNC Uberpuzzler     Gender: Posts: 1732 Re: Safe combination   « Reply #1 on: Jul 13th, 2003, 10:48pm » Quote Modify Two questions:   1. Is zero a valid combination number? 2. Upon failure, must the dial be turned back to zero before another attemp is made? IP Logged How about supercalifragilisticexpialidociouspuzzler [Towr, 2007] maryl Guest Re: Safe combination   « Reply #2 on: Jul 14th, 2003, 12:31pm » Quote Modify Remove on Jul 13th, 2003, 10:48pm, BNC wrote: Two questions:   1. Is zero a valid combination number? 2. Upon failure, must the dial be turned back to zero before another attemp is made?   1. Yes 2. No IP Logged Nick Guest Re: Safe combination   « Reply #3 on: Jul 14th, 2003, 11:46pm » Quote Modify Remove I count the number of turns required to be 1600.  This includes 0,0,0 as a combination.  My guess is low because the last digit is irelevant.  If the safe pops open when you reach the last number, then on the last number, just go past each number, and when you have the first 2 numbers of the combination right, the last one should immediately open the safe.  I would suggest starting with 0,0,x and then 1,0,x followed by 2,0,x...  Is 1600 correct? IP Logged maryl Guest Re: Safe combination   « Reply #4 on: Jul 15th, 2003, 7:59am » Quote Modify Remove Yup, that cracks it Nick. Could you hide your answer though, by inserting the word hide in square brackets before the answer, and /hide in the same brackets after -without any spaces between the brackets. IP Logged Nick Guest Re: Safe combination   « Reply #5 on: Jul 15th, 2003, 9:13am » Quote Modify Remove My bad... it was late... IP Logged towr wu::riddles Moderator Uberpuzzler Some people are average, some are just mean.     Gender: Posts: 13730 Re: Safe combination   « Reply #6 on: Jul 15th, 2003, 12:41pm » Quote Modify Nick's a guest, so he can't edit his post. You'd have to ask William. IP Logged Wikipedia, Google, Mathworld, Integer sequence DB Nick Guest Re: Safe combination   « Reply #7 on: Jul 17th, 2003, 4:28pm » Quote Modify Remove actually, in conjunction with it being late, I was excited for figuring out one of these damn riddles that no one posted an answer to yet...  Sorry again. IP Logged Pages: 1  Reply Notify of replies Send Topic Print Forum Jump: ----------------------------- riddles -----------------------------=> easy   - medium   - hard   - what am i   - what happened   - microsoft   - cs   - putnam exam (pure math)   - suggestions, help, and FAQ   - general problem-solving / chatting / whatever ----------------------------- general -----------------------------  - guestbook   - truth   - complex analysis   - wanted   - psychology   - chinese « Previous topic | Next topic »

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