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

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