Advent calendar 2017

8 December

The odd numbers are written in a pyramid.
What is the mean of the numbers in the 23rd row?
Tags: numbers


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Sunday Afternoon Maths LXVII

Coloured weights
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Cryptic crossnumber #2

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


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