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

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