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+--- Thread: Riddles, brain puzzles and mathematical problems (/thread-19232.html)
RE: Riddles, brain puzzles and mathematical problems - Bridge - 12-08-2012
(12-08-2012, 01:29 AM)Chronofox Wrote: still nopeIt's obvious my probability needs work. In any case, I looked over it again and came up with:
0.0274 (successful non-Swedish applicants) / 0.29272 (all successful applicants) = 9.36%
Is this correct?
RE: Riddles, brain puzzles and mathematical problems - Froge - 12-08-2012
yep you go next
RE: Riddles, brain puzzles and mathematical problems - Bridge - 12-08-2012
Light bulb
There is a room that contains one light bulb. Just outside the room there are three light switches, but only one of them is connected to the light bulb inside of the room (the other two don't do anything). You are allowed to set the switches in whatever position you like (they only have two states - on and off) and you can then enter the room. Note that you may only enter the room once (opening the door counts as entering it) and you cannot peak through the keyhole or any other opening. Find out which of the switches controls the light bulb.
RE: Riddles, brain puzzles and mathematical problems - Froge - 12-09-2012
Does the bulb start off light or dark?
Edit: nevermind
RE: Riddles, brain puzzles and mathematical problems - Bridge - 12-09-2012
(12-09-2012, 12:19 AM)Chronofox Wrote: Does the bulb start off light or dark?Yeah, it starts off dark and you have to determine which one turns it on.
Edit: nevermind
RE: Riddles, brain puzzles and mathematical problems - Froge - 12-09-2012
Can this puzzle even be solved?
Case 1: All switches off. The room is dark. The one that controls the bulb could be any of the three.
Case 2: Turn on one switch. If the room is light, then that switch must be the correct one. If the room is dark, it's either of the other two.
Case 3: Turn on two switches. If the room is dark, then the last switch must be the correct one. If the room is light, then the correct switch must be either of the two you just turned on.
Case 4: Turn on all switches. The room is light. The one that controls the bulb could be any of the three.
Cases 1 and 4 as well as 2 and 3 are reflections of each other (in terms of light/dark). 1 and 4 are useless, while cases 2 and 3 gives you a half chance of guessing the correct switch if it is dark or light respectively. Because we can't enter the room twice, I don't see how the puzzle could be solved.
RE: Riddles, brain puzzles and mathematical problems - Bridge - 12-09-2012
(12-09-2012, 12:56 AM)Chronofox Wrote: Can this puzzle even be solved?I couldn't solve it either, but if you apply some lateral thinking it is possible. The solution is actually quite ingenious.
Case 1: All switches off. The room is dark. The one that controls the bulb could be any of the three.
Case 2: Turn on one switch. If the room is light, then that switch must be the correct one. If the room is dark, it's either of the other two.
Case 3: Turn on two switches. If the room is dark, then the last switch must be the correct one. If the room is light, then the correct switch must be either of the two you just turned on.
Case 4: Turn on all switches. The room is light. The one that controls the bulb could be any of the three.
Cases 1 and 4 as well as 2 and 3 are reflections of each other (in terms of light/dark). 1 and 4 are useless, while cases 2 and 3 gives you a half chance of guessing the correct switch if it is dark or light respectively. Because we can't enter the room twice, I don't see how the puzzle could be solved.
RE: Riddles, brain puzzles and mathematical problems - Froge - 12-09-2012
dammit Bridge
there goes my sleep tonight
RE: Riddles, brain puzzles and mathematical problems - Bridge - 12-09-2012
(12-09-2012, 01:05 AM)Chronofox Wrote: dammit BridgeHave fun.
there goes my sleep tonight
RE: Riddles, brain puzzles and mathematical problems - BAndrew - 12-09-2012
(12-08-2012, 11:58 PM)Bridge Wrote: Light bulbIf this puzzle is solveable that means that there is a way to measure the temperature of the light bulb (so you know if it was open or not). It has to do something with that, otherwise the riddle is not solveable.
There is a room that contains one light bulb. Just outside the room there are three light switches, but only one of them is connected to the light bulb inside of the room (the other two don't do anything). You are allowed to set the switches in whatever position you like (they only have two states - on and off) and you can then enter the room. Note that you may only enter the room once (opening the door counts as entering it) and you cannot peak through the keyhole or any other opening. Find out which of the switches controls the light bulb.