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