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