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Advent calendar 2022

23 December

How many numbers are there between 100 and 1000 that contain no 0, 1, 2, 3, or 4?

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

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