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