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

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