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