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