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Advent calendar 2016

9 December

You start at A and are allowed to move either to the right or upwards.
How many different routes are there to get from A to B?

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

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