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AMC 12 2012a Problem 23

  • Paper

Let SS be the square one of whose diagonals has endpoints (0.1,0.7)(0.1,0.7) and (−0.1,−0.7)(-0.1,-0.7). A point v=(x,y)v=(x,y) is chosen uniformly at random over all pairs of real numbers xx and yy such that 0≤x≤20120 \le x \le 2012 and 0≤y≤20120\le y\le 2012. Let T(v)T(v) be a translated copy of SS centered at vv. What is the probability that the square region determined by T(v)T(v) contains exactly two points with integer coordinates in its interior?

(A) 18(B) 750(C) 425(D) 14(E) 825\textbf{(A)}\ \frac{1}{8} \textbf{(B) }\frac{7}{50} \textbf{(C) }\frac{4}{25} \textbf{(D) }\frac{1}{4} \textbf{(E) }\frac{8}{25}

Dataset text AMC 12 2000 to 2025. Quoted with source.

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