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

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