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