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