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