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