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