WebMaster wrote:
> See if you can work this out 
> http://www.richhook.com/psychic.swf
You think of a two digit number. Let's call that number M.
M is two digits long. We'll call the first digit A and the second digit B.
It asks you to subtract (A+B) from M to get a "final number" which we'll
call F. F = M-(A+B).
Now, M = 10*A + B, so
F = 10*A + B - (A+B)
= 10*A + B - A - B
= 9*A
Which means that F is always a multiple of 9.
Check all the multiples of 9 in the table: 9, 18, 27, 36, 45, 54, ...
Notice they all have the same symbol beside them.
--
Toby A Inkster BSc (Hons) ARCS
Contact Me ~
http://tobyinkster.co.uk/contact