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Topic: Mind Reader (Read 1937 times) |
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Locke64
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Mind Reader
« on: Jan 12th, 2007, 4:57pm » |
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Check out this flash mind reader.
Can you explain how it does it?
PS: I can, I'm just wondering if you can. ;)
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"Smart people don't care about homework and all that crap." ~ANTISNAKERZ_RULE
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"Not really, but-" ~ANTISNAKERZ_RULE
"You just proved yourself wrong!" ~LOCKE64
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Whiskey Tango Foxtrot
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Re: Mind Reader
« Reply #1 on: Jan 12th, 2007, 5:50pm » |
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I didn't look at the one you posted but they all operate on the same principle. For example, 44 and 45 both return the same number, 36. Or 20 through 28 all return 18. It's not really that much of a trick.
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"I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use." - Galileo Galilei
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Locke64
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Re: Mind Reader
« Reply #3 on: Jan 14th, 2007, 10:49am » |
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on Jan 14th, 2007, 7:30am, towr wrote:00 is a two digit number, isn't it?  |
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Since no one posted it yet, and it is very easy, I'll post it.
| hidden: | Any 2-digit number can be represented by 10x+y. First, you add x+y, then you subtract from the original number, thus giving you this equation:
10x+y-(x+y)
distribute the negative,
10x+y-x-y
'y's cancel out, and subtract one x from 10,
and you get 9x. Therefore, the answer is always a multiple of nine. Notice that all multiples of nine have the same symbol. |
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"Smart people don't care about homework and all that crap." ~ANTISNAKERZ_RULE
"Do you care about homework and all that crap?" ~LOCKE64
"Not really, but-" ~ANTISNAKERZ_RULE
"You just proved yourself wrong!" ~LOCKE64
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towr
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Re: Mind Reader
« Reply #4 on: Jan 14th, 2007, 10:59am » |
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on Jan 14th, 2007, 10:49am, Locke64 wrote:| Notice that all multiples of nine have the same symbol. |
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Except 0, 90, 99.
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Locke64
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Re: Mind Reader
« Reply #5 on: Jan 14th, 2007, 11:06am » |
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on Jan 14th, 2007, 10:59am, towr wrote:
Yeah, because in order to get 0, x would have to be zero, and in order to get 90 or 99, x would have to be 10 or 11. It must be a 2-digit number.
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"Smart people don't care about homework and all that crap." ~ANTISNAKERZ_RULE
"Do you care about homework and all that crap?" ~LOCKE64
"Not really, but-" ~ANTISNAKERZ_RULE
"You just proved yourself wrong!" ~LOCKE64
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Icarus
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Re: Mind Reader
« Reply #7 on: Jan 14th, 2007, 7:20pm » |
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If you were to search enough, I think you would find at least 2 more versions of this same trick that people have posted - plus several other tricks that also rely on the fact that a number and the sum of its digits are equivalent modulo 9. In fact, almost all of the math tricks I have heard rely on this fact.
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"Pi goes on and on and on ...
And e is just as cursed.
I wonder: Which is larger
When their digits are reversed? " - Anonymous
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towr
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Re: Mind Reader
« Reply #8 on: Jan 15th, 2007, 1:19am » |
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on Jan 14th, 2007, 7:20pm, Icarus wrote:| In fact, almost all of the math tricks I have heard rely on this fact. |
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There's a few relying on odd/even; and of course binary coding.
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Icarus
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Re: Mind Reader
« Reply #10 on: Jan 16th, 2007, 2:21pm » |
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That's why I said that only almost all the math tricks I've heard depend on it. Even Sir Col's second example does: The rearranged digits of the number has the same digit sum, so the two numbers are = mod 9. Therefore, their difference = 0 mod 9. Hence its digits add up to a multiple of 9. Once you drop a digit, this is no longer so. So add up the digits of the final answer, and subtract that from the next higher multiple of 9. The result is the digit that was dropped.
The first challenge is more creative. Of course, you have to go to H for it to work - stopping at G would be ambiguous!
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"Pi goes on and on and on ...
And e is just as cursed.
I wonder: Which is larger
When their digits are reversed? " - Anonymous
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Random Lack of Squiggily Lines
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Re: Mind Reader
« Reply #11 on: Mar 12th, 2007, 5:48pm » |
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i chose 99 but it came out with a snowflake, not a bell!
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You can only believe i what you can prove, and since you have nothing proven to cmpare to, you can believe in nothing.
I have ~50 posts to hack a "R" into a "D". Which one?
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Random Lack of Squiggily Lines
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Everything before 7/1/2008 is now irrelevant.
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Re: Mind Reader
« Reply #12 on: Mar 12th, 2007, 5:49pm » |
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i tried 10 times but it was always wrong 
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You can only believe i what you can prove, and since you have nothing proven to cmpare to, you can believe in nothing.
I have ~50 posts to hack a "R" into a "D". Which one?
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Icarus
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Re: Mind Reader
« Reply #13 on: Mar 12th, 2007, 7:27pm » |
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You have to follow the instructions for it to work: Note that it says you should pick a two digit number then subtract the sum of the digits of the number from itself. It is the result of this practice that gives you your symbol.
For example, if you originally pick 99, you have to calculate 99 - (9+9) = 81. It is the symbol for 81 that will appear, not the symbol for 99.
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"Pi goes on and on and on ...
And e is just as cursed.
I wonder: Which is larger
When their digits are reversed? " - Anonymous
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Iceberg
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Re: Mind Reader
« Reply #14 on: Mar 31st, 2007, 12:41am » |
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Forget math tricks and multiples. A lot of the symbols were the same even right next to each other
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BNC
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Re: Mind Reader
« Reply #15 on: Mar 31st, 2007, 3:21pm » |
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on Mar 31st, 2007, 12:41am, Iceberg wrote:| Forget math tricks and multiples. A lot of the symbols were the same even right next to each other |
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However, without the "math tricks and multiples" it wouldn't have worked every single time.
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How about supercalifragilisticexpialidociouspuzzler [Towr, 2007]
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ThudnBlunder
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Re: Mind Reader
« Reply #16 on: Mar 31st, 2007, 6:02pm » |
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on Jan 12th, 2007, 4:57pm, Locke64 wrote:
Here's another you might like.
And how about this?
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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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Icarus
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Re: Mind Reader
« Reply #17 on: Apr 1st, 2007, 12:31pm » |
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Gosh - that first site is really amazing! It's even better than it claims. Try this: don't just call out one card. Call them all out. It'll still work! Every card you called will be removed from the 2nd page! WOW! 
What is a real hoot are the people who wrote in to claim that it failed to work for them - particularly those who claim it failed repeatedly! 
The second site is more interesting, in my opinion, as it is a real accomplishment, not just a trick. Even if the accomplishment is just a nice pattern recognition routine.
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"Pi goes on and on and on ...
And e is just as cursed.
I wonder: Which is larger
When their digits are reversed? " - Anonymous
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ima1trkpny
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Re: Mind Reader
« Reply #18 on: May 13th, 2007, 12:52pm » |
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I didnt get quite the same result from the first site... I worked twice and failed 5 times when calling out multiple cards... very neat experiment though... i wonder how that one works... anyone?
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"The pessimist sees difficulty in every opportunity. The optimist sees the opportunity in every difficulty." -Churchill
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william11141
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Re: Mind Reader
« Reply #19 on: May 13th, 2007, 3:15pm » |
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OMG lol, pretty eazy if you think about it... when you choose any 2 digit number and do the magic-subtraction-doohicy thing you get surtain numbers. The graph thing changes everytime...but if you look closely, the symbols for all the possable finished answers are the same, and thats the symbol that apperas on the ball...
ops, locker already gave the answer... DAMMIT! i didnt get here fast enogh... 
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| « Last Edit: May 13th, 2007, 3:16pm by william11141 » |
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Icarus
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Re: Mind Reader
« Reply #20 on: May 13th, 2007, 6:29pm » |
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on May 13th, 2007, 12:52pm, ima1trkpny wrote:| I didnt get quite the same result from the first site... I worked twice and failed 5 times when calling out multiple cards... very neat experiment though... i wonder how that one works... anyone? |
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You need to keep better track, then. NONE of the cards on the first page are on the second page! So it doesn't matter what you pick, you won't see it on the second page. The trick works because people only keep track of their picked card, they don't pay any attention to the other cards.
This is why I thought it was a hoot that people kept writing in to him to say it didn't work for them!
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"Pi goes on and on and on ...
And e is just as cursed.
I wonder: Which is larger
When their digits are reversed? " - Anonymous
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ima1trkpny
Senior Riddler
"Double click on 'Yes'... Hey!"
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Re: Mind Reader
« Reply #21 on: May 16th, 2007, 9:45pm » |
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Thanks Icarus... I didn't notice that >.<
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"The pessimist sees difficulty in every opportunity. The optimist sees the opportunity in every difficulty." -Churchill
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Aurora
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Re: Mind Reader
« Reply #22 on: May 28th, 2007, 8:22am » |
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Icarus, you are a genius, I had come across that site before and had no idea of what was going on, (although I wasn't inclined to believe that the software tracks your eye movement or where your mouse is on the page).
It's so simple yet incredibly effective. I just want to know how long it toook you to figure it out!
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"In these days, a man who says a thing cannot be done is quite apt to be interrupted by some idiot doing it."- Elbert Green Hubbard
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ima1trkpny
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Re: Mind Reader
« Reply #23 on: May 28th, 2007, 8:42pm » |
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I second that! I only noticed that the same number of cards were there so I couldn't figure out what was going wrong... seriously... how long did it take you? (probably not long  )
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"The pessimist sees difficulty in every opportunity. The optimist sees the opportunity in every difficulty." -Churchill
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towr
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Re: Mind Reader
« Reply #24 on: May 28th, 2007, 11:31pm » |
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I don't know about Icarus, but usually the second thing I try is cheat; in this case, take two cards. And hey, neither is there the next time.
Trying to cheat at a game is the fastest way to understand the rules, because you have to find their limits to break them.
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