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