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Advent calendar 2016

21 December

Today's number is a multiple of three. The average (mean) of all the answers that are multiples of three is a multiple of 193.
Tags: averages, mean

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

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