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

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