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

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