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