Question 7
The 7 × 7 chessboard contains one shaded square as shown. How many squares of any size do not include the shaded square?
**Editorial note for this self-study exercise:** Count squares whose sides lie on the grid lines. The shaded cell is row 4 from the top and column 6 from the left. A square includes it when that entire cell lies inside the square. Enter the count.
**Editorial note for this self-study exercise:** Count squares whose sides lie on the grid lines. The shaded cell is row 4 from the top and column 6 from the left. A square includes it when that entire cell lies inside the square. Enter the count.