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Click here to win prizes by solving the mscroggs.co.uk puzzle Advent calendar.
Click here to win prizes by solving the mscroggs.co.uk puzzle Advent calendar.

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

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