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