Question 63
So-poko is a new puzzle game played on a square grid of side $203$ cells. The cells are colored white and black in alternating concentric frames; the outermost frame is black, while the central cell is white (see on the side an example of size $7 \times 7$). What is the difference between the number of black cells and the number of white cells in the grid?
(A) 103
(B) 203
(C) 207
(D) 303
(E) 407 .
(A) 103
(B) 203
(C) 207
(D) 303
(E) 407 .