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

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