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

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