Talk:2012 AMC 10A Problems/Problem 20
Revision as of 15:08, 10 February 2012 by Bobcroucher (talk | contribs) (Created page with "I get <math>\frac{49}{256}</math> for this problem. I used your same logic, but noted that the center square can start out white or black, giving us: <math>\frac{2\times7\times7...")
I get 
for this problem. I used your same logic, but noted that the center square can start out white or black, giving us: 
.
