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

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