A Much Easier Trick
Posted on:: February 13th, 2003
The top of the Daypop Top 40 today is a mind-reading trick that is orders of magnitude easier to figure out than the Car Talk puzzler. Nevertheless, I fell for it like Republicans fall for tax cuts. D’oh!
holy crap! I don’t get it–how does it work. IT WORKS? yikes….
Don’t get spooked. You’re just being fooled. I had to look up the answer. Look forward to feeling like a dope! :)
consider a 2-digit number n with the first digit a and the second digit b
n=10a+b
Subtract (a+b)
9a
Thus the answer is always a multiple of 9, and there are only 9 possible answers – 9 though 81. The code always puts the same character for each one.
Yes, but that’s not what makes the trick so puzzling. Let me make explicit what you, Kevin, are assuming we’ve figured out: Every time you reload the puzzle, it scrambles the symbols so you don’t notice that it’s always giving you the same answer.
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