9 Feb
2008
9 Feb
'08
1:35 p.m.
On Feb 9, 2008 2:24 AM, Dan Asimov <dasimov@earthlink.net> wrote:
QUESTION: What makes one 3x4 array with 6 sets among them "harder" than another? (I often find this online puzzle's "level 4" to be easier than its "level 3", so this has me wondering.)
I think that harder sets are ones where all four attributes are different, and the easiest are the ones where only one attribute varies. So the level 4 ought to have a higher proportion where three or four attributes are different. --Joshua Zucker