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Advent calendar 2017

7 December

The odd numbers are written in a pyramid.
What is the sum of the numbers in the seventh row?
Tags: numbers

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

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