TITLE: Tricky Rectangle Problem
QUESTION [6 upvotes]: How many rectangles are there which do not include any yellow squares?

REPLY [12 votes]: What I did is, in each square, count the number of rectangles that could be drawn having the same upper left corner as that square, which also do not include the shaded squares I also got 257. I hope someone will check my work. I have a bit of a dyslexia - type problem and it's really hard for me to do things like this without messing up.