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