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