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Advent calendar 2021

15 December

The odd numbers are written in a pyramid.
What is the mean of the numbers in the 19th row?

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Tags: numbers

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

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