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Advent calendar 2015
17 December
All 2015 advent puzzles
~
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In March, I posted the puzzle
One Hundred Factorial
, which asked how many zeros 100! ends with.
What is the smallest number, n, such that n! ends with 50 zeros?
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205
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factorials
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crossnumbers
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calculus
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triangles
chocolate
coins
rectangles
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mean
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floors
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percentages
colouring
geometric mean
volume
speed
perfect numbers
lines
numbers
indices
expansions
rugby
cryptic crossnumbers
scales
axes
polygons
sum to infinity
balancing
medians
tournaments
chess
coordinates
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menace
factorials
wordplay
symmetry
dice
square grids
unit fractions
digits
pascal's triangle
cube numbers
folding tube maps
geometric means
squares
circles
multiples
gerrymandering
tiling
factors
logic
integration
fractions
planes
cryptic clues
area
dominos
median
tangents
bases
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grids
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sets
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dodecagons
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square roots
addition
shape
even numbers
remainders
2d shapes
regular shapes
averages
pentagons
irreducible numbers
hexagons
sport
determinants
money
combinatorics
consecutive integers
cubics
trigonometry
perimeter
graphs
binary
division
advent
taxicab geometry
people maths
functions
decahedra
numbers grids
surds
time
cards
chalkdust crossnumber
powers
spheres
ave
probabilty
integers
multiplication
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ellipses
dates
clocks
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number
routes
doubling
matrices
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christmas
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