http://www.digicc.com/fido/fido.swf

Posted on 2005-03-03 17:22:10 by bitRAKE

Posted on 2005-03-03 17:22:10 by bitRAKE

Very good indeed, I like to understand better how it works.

1. Pick a number (M)

2. Randomize digits in (M) to form another number (N)

3. Absolute value of (M-N)

4. Extract a non-zero number from (X) to produce (Y)

5. Randomize digits in (Y) to form answer (Z)

It is trivial to find the digit needed to add to (Z) to produce multiples of nine because the digits always sum to a multiple of nine and zero is not allowed to be excluded in step 4.

This works even at the pub for a beer (2 so far)! :lol:

this once - it really helps to know your math and science.

2. Randomize digits in (M) to form another number (N)

3. Absolute value of (M-N)

__equals a multiple of nine__(X)4. Extract a non-zero number from (X) to produce (Y)

5. Randomize digits in (Y) to form answer (Z)

It is trivial to find the digit needed to add to (Z) to produce multiples of nine because the digits always sum to a multiple of nine and zero is not allowed to be excluded in step 4.

This works even at the pub for a beer (2 so far)! :lol:

this once - it really helps to know your math and science.

I made $20 with this once - it really helps to know your math and science.

Wow i will try this at home today.

it failed for me '9' while there is no 9 in sight :P

Yea that is the problem with mod 9. You can't tell whether the missing digit is 0 or 9. :-D

That is why is says not to circle a zero. :roll:

hmm, yes, i picked "111" so of course, it failed for me :)