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Advent calendar 2015

16 December

Today's number is four thirds of the average (mean) of the answers for 13th, 14th, 15th and 16th December.

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

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