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

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