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

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