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