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