> Take ANY three consecutive numbers with the largest divisible by 3. > Add them. > If the sum as multiple digits add the digits. Else done. > Again if multiple digits, add them, etc etc. > Once you arrive at a single digit number the result will be 6.
-5, -4, -3 => 3
> If the three consecutive numbers had the smallest divisible by three, > the result will always be 3. > > If the middle one , etc, thre result will always be 9. > > Prove!!