Mind reader

by Volker Weber

This site reads your mind. Really. You have to try it. It's incredible. How does it work? Read the first comment.

[via Industrial Technology & Witchcraft]

Comments

This trick does not work very well with Visual Mathematicians. :-)

You have to think of two digits, let's call them x and y. So the number will be 10x + y. If x = 2 and y = 3 that is 23. The sum is x + y, in this example 5. Subtract from the two digit number and you get 18. Now assume you thought of y = 4. That would be 24 and 6, where 24 - 6 is also 18.

Let's do the algebra. (10x + y) - (x + y) = (10x - x) + (y - y) = 9x.

It does not matter what y is. You always get a number that can be divided by 9. Now look at the website. All of these have the same symbol. 0, 9, 18, 27 ...

Bingo.

Volker Weber, 2003-02-13

It got me for sure...couldn't figure out how the symbol was different every time. The symbol that is the multiple of 9 is DIFFERENT each attempt! Holy shit -- that is a good trick :)

Ed Brill, 2003-02-13

Thanks. I was right on the edge of the solution, but couldn't quite get over the last hump. I didn't fully understand your solution, but it was enough to get me there. I love it when the light bulb in my brain suddenly flashes followed by the explosion of "I have it! I understand!"

Hi. As you notice the numbers 90 and 99 may have different symbols, but that doesn't matter since the largest result we may have is 9 * 9 = 81. A nice trick !

Sigbjorn Hals, 2003-04-02

u cant do mind reader

mitch, 2003-04-05

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I explain difficult concepts in simple ways. For free, and for money. Clue procurement and bullshit detection.

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