Sunday Afternoon Maths LXI

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