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pascal's triangle probabilty percentages games averages division crossnumber routes fractions square numbers prime numbers coordinates people maths palindromes chalkdust crossnumber chess volume algebra planes 2d shapes proportion quadratics partitions spheres area floors scales median triangle numbers 3d shapes surds shape crosswords cryptic clues squares chocolate multiples functions sequences dodecagons rectangles elections number probability wordplay remainders means gerrymandering sum to infinity ave products cube numbers graphs money perfect numbers advent geometry complex numbers cards numbers factors digital clocks indices dice lines integration trigonometry regular shapes parabolas speed grids tiling square roots menace odd numbers range unit fractions logic symmetry polygons rugby digits bases the only crossnumber circles books taxicab geometry clocks perimeter mean calculus star numbers coins ellipses integers dates triangles sums time christmas dominos balancing doubling shapes crossnumbers addition factorials multiplication cryptic crossnumbers differentiation colouring folding tube maps hexagons angles arrows irreducible numbers sport