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

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