2011 AMC 10A Problems/Problem 25: Difference between revisions

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-==Problem 25==
+#redirect [[2011 AMC 12A Problems/Problem 22]]
-Let <math>R</math> be a square region and <math>n\ge4</math> an integer.  A point <math>X</math> in the interior of <math>R</math> is called <math>n\text{-}ray</math> partitional if there are <math>n</math> rays emanating from <math>X</math> that divide <math>R</math> into <math>n</math> triangles of equal area.  How many points are 100-ray partitional but not 60-ray partitional?
-<math>\text{(A)}\,1500 \qquad\text{(B)}\,1560 \qquad\text{(C)}\,2320 \qquad\text{(D)}\,2480 \qquad\text{(E)}\,2500</math>