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