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wu :: forums    riddles    easy (Moderators: Grimbal, ThudnBlunder, towr, Icarus, SMQ, Eigenray, william wu)    turning cards?? « Previous topic | Next topic » Pages: 1  Reply Notify of replies Send Topic Print    Author  Topic: turning cards??  (Read 628 times) valerfor Guest turning cards??   « on: May 17th, 2004, 7:35am » Quote Modify Remove This puzzle is given by my lecturer and he has not released the solution yet We are given a deck of 52 cards and 10 cards are overturned. The lights are off so we cannot see which are the overturned cards.   We are then required to seperate the deck into piles having the same number of overturned cards. How do we go about doing it? IP Logged towr wu::riddles Moderator Uberpuzzler Some people are average, some are just mean.     Gender: Posts: 13730 Re: turning cards??   « Reply #1 on: May 17th, 2004, 8:20am » Quote Modify The piles only need to have an equal number of overturned cards, otherwise they may differ in size, and that helps..   You could try it with less cards first, like 6 cards with 2 turned over « Last Edit: May 17th, 2004, 8:22am by towr » IP Logged Wikipedia, Google, Mathworld, Integer sequence DB Cathos Full Member Carpe Canum     Gender: Posts: 246 Re: turning cards??   « Reply #2 on: May 17th, 2004, 2:21pm » Quote Modify This one is similar to one of the coin-game riddles, I believe.  It's very clever; I stumped everyone at work with it. IP Logged Sum Arbor Sir Col Uberpuzzler impudens simia et macrologus profundus fabulae     Gender: Posts: 1825 Re: turning cards??   « Reply #3 on: May 17th, 2004, 2:54pm » Quote Modify Just for clarity, are we saying that the pack of 52 cards has 10 face-up cards and 42 face-down cards randomly distrubuted throughout the pack? And we need to design a "blind-folded" method of creating piles containing the same number of face-up cards? IP Logged mathschallenge.net / projecteuler.net towr wu::riddles Moderator Uberpuzzler Some people are average, some are just mean.     Gender: Posts: 13730 Re: turning cards??   « Reply #4 on: May 18th, 2004, 12:02am » Quote Modify yes. (I'm sure it's on the site in a different guise allready, but it seems impossible to find the thread) IP Logged Wikipedia, Google, Mathworld, Integer sequence DB BNC Uberpuzzler     Gender: Posts: 1732 Re: turning cards??   « Reply #5 on: May 18th, 2004, 1:20am » Quote Modify on May 18th, 2004, 12:02am, towr wrote: yes. (I'm sure it's on the site in a different guise allready, but it seems impossible to find the thread)   this one? IP Logged How about supercalifragilisticexpialidociouspuzzler [Towr, 2007] towr wu::riddles Moderator Uberpuzzler Some people are average, some are just mean.     Gender: Posts: 13730 Re: turning cards??   « Reply #6 on: May 18th, 2004, 4:21am » Quote Modify yep, that's the one.. I salute your l33t thread finding skilz   IP Logged Wikipedia, Google, Mathworld, Integer sequence DB valerfor Guest Re: turning cards??   « Reply #7 on: May 18th, 2004, 7:49am » Quote Modify Remove hehe thanks guys!!! i tried looking for this puzzle in this site but just couldnt find it... the solution is simple and nice! thanks! 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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