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