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