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