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