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

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