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