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