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