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