Quote:
Originally Posted by vivekk
It really is very simple maths, NFS! 
Let's use a bit of algebra!
You pick 2 digits, so let's say the number is written as 'ab'.
'a' must be at least 1 & b could be 0-9, so
'ab' actually equalls (10 x a) + b
Take away (a+b):
(10 x a) + b - (a + b) = 9 x a
So, you' re only ever left with the 9-times table- all the symbols are the same for those numbers. 
Viv |
ahh .. clever bit is that it rotates the symbols used for the multiples of 9 each time.
Bit slow tonight .. maybe its the pouilly fume