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