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

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