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