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Advent calendar 2015

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

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