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