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Topic: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/YaBB (Read 32035 times) |
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mikedagr8
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #25 on: Sep 25th, 2007, 5:13pm » |
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on Sep 25th, 2007, 4:55pm, srn347 wrote:| Ok. For any specific number(for weighings or coins), I can find the other one. I believe the answer to the w thing is 3w. |
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You're kidding me right!!! Unbelievable. He can read!!! 
on Sep 24th, 2007, 12:39am, Grimbal wrote:
If the number of coins is a multiple of 3, you can make 3 equal heaps and find out in a single weighing which heap has the fake coin.
So, each weighing can reduce by 3 the number of coins that could be fake. Or seen the other way round, each additional weighing lets you find the coin among 3 times as many coins.
With 1 weighing you can find the fake among 3 coins.
With 2 weighings you can find it among 9 coins. 9 is 3 times 3.
With 3 weighings you can find it among 27 coins. 27 is 3 times 9.
The pattern that emerges is:
With W weighings you can find it among 3W coins.
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srn437
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #26 on: Sep 25th, 2007, 5:14pm » |
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I did that intentionally! how did you not know? HOW?!
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ThudnBlunder
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #27 on: Sep 25th, 2007, 6:02pm » |
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on Sep 25th, 2007, 5:13pm, mikedagr8 wrote:
You're kidding me right!!! Unbelievable. He can read!!!
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You claim to have reduced your baiting. 
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THE MEEK SHALL INHERIT THE EARTH.....................................................................er, if that's all right with the rest of you.
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mikedagr8
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #28 on: Sep 25th, 2007, 6:04pm » |
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on Sep 25th, 2007, 6:02pm, ThudanBlunder wrote:
You claim to have reduced your baiting.
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That was not baiting. That was showing how he has improved.
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srn437
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #29 on: Sep 25th, 2007, 7:24pm » |
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Baiting? I am not a fish!
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Sir Col
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #30 on: Sep 25th, 2007, 11:44pm » |
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srn347, now you have the general solution to the "it is known that the fake coin is heavier or lighter" version, why don't you have a crack at "it is not known" version.
May I suggest you try solving for 2 coins, 3 coins, 4 coins, and 12 coins, where one is a fake but it is not known if it is heavier or lighter than a normal coin. What can you deduce about the 2 coin case? Remember that you are looking for the minimum number of weighings required to guarantee finding the fake.
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Grimbal
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #31 on: Sep 26th, 2007, 12:36am » |
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Uh... srn, do you know what these orange blocks are?
this is an example
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srn437
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #32 on: Sep 26th, 2007, 7:04am » |
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Yes I know, but why would I use them?
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Grimbal
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #33 on: Sep 26th, 2007, 8:34am » |
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I was wondering if you could read them. I thought that if you didn't know that there was hidden text, that would explain why sometimes you didn't see that a problem has been answered.
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srn437
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #34 on: Sep 26th, 2007, 7:20pm » |
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I already said that was intentional! Forget it! Next riddle, one coin weighs -1, one weighs a positive number times -1, and one weighs 1. You only know the one that weighs one. How do you differentiate the other two.
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FiBsTeR
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #35 on: Sep 26th, 2007, 8:12pm » |
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Hint: Divide the negative masses by negative zero. <--Dead giveaway.
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srn437
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #36 on: Sep 26th, 2007, 8:14pm » |
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<press caps lock> YOU CANNOT DIVIDE BECAUSE THIS IS NOT AN EQUATION! <press caps lock>(self contradictory)
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srn437
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #37 on: Sep 26th, 2007, 8:18pm » |
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Thanks for reminding me, it can't be one.
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ThudnBlunder
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #38 on: Sep 26th, 2007, 8:19pm » |
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on Sep 26th, 2007, 7:20pm, srn347 wrote:| Next riddle, one coin weighs -1, one weighs a positive number times -1, and one weighs 1. You only know the one that weighs one. How do you differentiate the other two. |
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I don't; I just assume that the positive number is equal to 1 and take the rest of the day off.
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srn437
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #39 on: Sep 26th, 2007, 8:25pm » |
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WELL IT ISN'T! And if you'll take the day off, try the logic gate one while you do it.
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ThudnBlunder
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #40 on: Sep 26th, 2007, 8:38pm » |
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on Sep 26th, 2007, 8:25pm, srn347 wrote:| WELL IT ISN'T! And if you'll take the day off, try the logic gate one while you do it. |
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Nah, I think I'll just use the door like everybody else.
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THE MEEK SHALL INHERIT THE EARTH.....................................................................er, if that's all right with the rest of you.
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srn437
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #41 on: Sep 26th, 2007, 8:40pm » |
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Now I see why thunder and blunder weren't meant to mix.
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Noke Lieu
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #42 on: Sep 26th, 2007, 10:00pm » |
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srn347....
don't do it man.
You're not smart enough to take him on. Seriously.
Not at maths, not at general knowledge, not at chess.
Not at spelling, not a word games, nor at tying shoelaces.
"thudnblunder"... it's a spoonerism. It's very clever.
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a shade of wit and the art of farce.
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Sir Col
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #43 on: Sep 27th, 2007, 12:29am » |
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on Sep 26th, 2007, 7:20pm, srn347 wrote:
Whoa! (and to use the words of Simon and Garfunkel) Slow down you move too fast. You've still not solved the alternative challenge I presented to you. Surely you don't expect other people to solve your problems if you don't solve anyone else's?!
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mikedagr8
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #44 on: Sep 27th, 2007, 1:02am » |
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Hahaha. Since this is a real problem, nothing weighs negative. I solved it; no discussion.
Good call Col and Noke.  
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| « Last Edit: Sep 27th, 2007, 1:16am by mikedagr8 » |
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Grimbal
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #45 on: Sep 27th, 2007, 1:14am » |
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You glue the 1 coin to one of the other coins (-1 coin or -n (n>1) coin). If it flies to the ceiling, it is the -n coin, if it floats in mid-air, it is the -1 coin.
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JiNbOtAk
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #46 on: Sep 27th, 2007, 1:42am » |
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on Sep 26th, 2007, 10:00pm, Noke Lieu wrote:
Not at spelling, not a word games, nor at tying shoelaces. |
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Is this considered baiting ? 
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mikedagr8
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #47 on: Sep 27th, 2007, 1:48am » |
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on Sep 27th, 2007, 1:42am, JiNbOtAk wrote:
Is this considered baiting ? |
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It's called honesty.
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srn437
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Re: http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/
« Reply #48 on: Sep 27th, 2007, 4:39pm » |
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Actually it can weigh negative because since this riddle is hypothetical, I have the power of 'if'. You cannot glue them, and it might not fly, because the positive number is not neccesarily an integer.
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