The 9 horizontal and 9 vertical lines on an \( 8 \times 8 \) chessb...

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The 9 horizontal and 9 vertical lines on an \( 8 \times 8 \) chessboard form ' \( r \) ' rectangles and 's' squares. The ratio \( \frac{\mathrm{s}}{\mathrm{r}} \) in its lowest terms is
\( \mathrm{P} \)
(A) \( 1 / 6 \)
(B) \( 17 / 108 \)
(C) \( 4 / 27 \)
(D) none
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