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