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