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