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