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