+118723 
+65 Mar 14, 2015
+4 How many different three-step paths along the edges of a cube are there that take you from vertex $A$ to vertex $B$? (A step is from a vertex to an adjacent vertex sharing an edge.) size(101); import three; currentprojection=orthographic(1/2,-1,1/4); draw((0,0,0)--(1,0,0)--(1,0,1)--(0,0,1)--(0,0,0));read more .. Let's play mini-Sudoku! size(3cm); draw((0,0)--(4,0)--(4,4)--(0,4)--cycle,black+2bp); draw((0,2)--(4,2),black+2bp); draw((2,0)--(2,4),black+2bp); draw((0,1)--(4,1)); draw((0,3)--(4,3)); draw((1,0)--(1,4)); draw((3,0)--(3,4)); We wish to place an "X" in
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+1832
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