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# Re: OT: Unbelievable

From: John Cowan Friday, June 6, 2003, 19:35
```BP Jonsson scripsit:

> Is there a mathematical explanation to this?
> Not that I would understand such an explanation,
> but I'd like to know if there is one.
Sure, it's simple.  Two things to notice:  the chart of symbols is
different every time, and every multiple of 9 (9, 18, 27, 36, etc.) is
always the same symbol -- the one which will pop up when you click on the
crystal ball.  So the page simply has to arrange that the number you are
thinking of is a multiple of 9.

Consider the two digit number AB, which is equal to A * 10 + B.  If we
then subtract A + B from this, we get A * 10 + B - A - B, which is 9 * A,
which obviously is a multiple of 9.  It's done.

It took me a while to figure it out, too.

--
John Cowan                              <jcowan@...>
http://www.ccil.org/~cowan              http://www.reutershealth.com
Unified Gaelic in Cyrillic script!
http://groups.yahoo.com/group/Celticonlang
```