ESP

You might ike these:

http://www.magicandillusion.com/tric/idisc/idisc01.html

http://digicc.com/fido/

http://www.magicandillusion.com/tric/idisc/idisc01.html
(Click Flash button on left, and then 'Flash mind reader' in next window.)

I've sussed how the first one works, but I don't have a pen and paper to try the Fido one.

the first one is simple: all the cards are different the second time, but you are expected to only notice that your card is gone - check it

the second doesn't work. it always guesses a single-digit number (unless it is temporarily messed up for some reason)

Originally posted by Mouse2
the second doesn't work. it always guesses a single-digit number (unless it is temporarily messed up for some reason)

Originally posted by THUDandBLUNDER
That's what it is supposed to do.

1) Choose a 4-digit number, eg. 9433
2) Rearrange its digits to make a another 4-digit mumber, 3934
3) Subtract the smaller number from the larger. 9433 - 3934 = 5499
4) Circle one of the digits of the resulting number. (But not '0' 'cos that's already a circle.) eg. circle '5'
5) Input into the computer ...[text shortened]... which number you circled, but only if you concentrate real hard on that number. 😲

.

Originally posted by TheMaster37
Do the same, and give me the three digits, i will guess the fourth digit 🙂

Originally posted by THUDandBLUNDER
2, 3, and 4

unless i messed up the site gave me the wrong number

do this one

322

Originally posted by Garrison
unless i messed up the site gave me the wrong number

do this one

322

rule 1) For any number, the number modulo 9 is equal to the sum of its digits modulo 9

So by scrambling the digits of the original number we don't change the sum of the digits and we don't change its value modulo 9

i.e, when we take the scrambled number away from the original we have done the sum: (9x + m) - (9y + m)

Hence the answer will be 9*(x-y)

Hence we know the answer is 0 modulo 9

Knowing three of the digits of the answer, using rule 1 we can work out the fourth (modulo 9), it is 9 - (sum of 3 digits). We have to add 9 if that sum results in zero or a negative number.

well i had 3622 and i picked the 6... did i mess it up somewhere?

Originally posted by Garrison
well i had 3622 and i picked the 6... did i mess it up somewhere?