# New Internet Math Puzzle... - Hewlett Packard

This is a discussion on New Internet Math Puzzle... - Hewlett Packard ; This this New, Or just New Again...??? http://www.digicc.com/fido/...

# Thread: New Internet Math Puzzle...

1. ## New Internet Math Puzzle...

This this New, Or just New Again...???

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

2. ## Re: New Internet Math Puzzle...

On Jul 31, 10:22*pm, TranslucentAmoebae
wrote:
> This this New, Or just New Again...???
>
> http://www.digicc.com/fido/

the digits in the difference have to add up to 0 mod 9.

If you enter 120, the sum of these digits is 3. 3+6 = 0 mod 9.

No, I never saw it before, but, yes, I'm a PhD student in math.

3. ## Re: New Internet Math Puzzle...

It's way different and not really math but Ilike this mind reader:

http://omgwtf.superlime.com/psychic.swf

4. ## Re: New Internet Math Puzzle...

On Aug 2, 1:46*pm, George Bailey wrote:
> It's way different and not really math but Ilike this mind reader:
>
> http://omgwtf.superlime.com/psychic.swf

The sum of the digits in the difference between any two permutations
of the same four digit number is a multiple of nine. Not math?

5. ## Re: New Internet Math Puzzle...

wtfinc schrieb:
> On Aug 2, 1:46 pm, George Bailey wrote:
>> It's way different and not really math but Ilike this mind reader:
>>
>> http://omgwtf.superlime.com/psychic.swf

>
> The sum of the digits in the difference between any two permutations
> of the same four digit number is a multiple of nine. Not math?

Sure, there's some math involved...but the trick - sorry - the mind