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Advent calendar 2017

16 December

There are 204 squares (of any size) in an 8×8 grid of squares. Today's number is the number of rectangles (of any size) in a 2×19 grid of squares

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

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