no 4 on a plane (3*3*3 puzzle)
der Mouse <mo...@thunder.mcrcim.mcgill.edu>
In article <1992Nov27.161606.1...@odin.diku.dk>, torb...@diku.dk (Torben AEgidius Mogensen) writes:
> sil
...@math25.mathematik.uni-bielefeld.de (Torsten Sillke) writes:
>> On the 2*2*2 grid you can take 5 points, such that no 4 points lay
>> on a plane. [...] Can you find the only possibility to take 8
>> points in the 3*3*3 grid with the same property?
> How about
> . x . x . . . . o
> . . x . . . x . .
> o . . . . x . x .
Sorry. The six (!) points I marked with x are all in the same plane.
der Mouse
mo...@larry.mcrcim.mcgill.edu
