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

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