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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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numbers
,
factorials
,
multiplication
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Advent calendar 2023
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List of all puzzles
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coins
probabilty
balancing
tiling
remainders
coordinates
triangle numbers
squares
proportion
logic
multiples
axes
chess
algebra
ellipses
christmas
median
rectangles
bases
functions
pascal's triangle
hexagons
the only crossnumber
volume
parabolas
folding tube maps
advent
crossnumber
prime numbers
integers
consecutive integers
irreducible numbers
circles
fractions
games
differentiation
percentages
cryptic clues
number
sets
symmetry
albgebra
factorials
graphs
decahedra
polynomials
sums
elections
dice
range
wordplay
speed
binary
odd numbers
rugby
matrices
square numbers
partitions
menace
cubics
floors
geometric means
digits
crosswords
perimeter
chalkdust crossnumber
sequences
perfect numbers
expansions
tournaments
pentagons
star numbers
cryptic crossnumbers
dominos
factors
clocks
quadratics
colouring
shape
integration
scales
geometry
shapes
ave
means
geometric mean
determinants
digital clocks
combinatorics
gerrymandering
calculus
chocolate
area
mean
complex numbers
people maths
tangents
palindromes
unit fractions
taxicab geometry
spheres
lines
grids
probability
cube numbers
square roots
3d shapes
dodecagons
sport
digital products
doubling
time
multiplication
consecutive numbers
routes
surds
polygons
crossnumbers
planes
sum to infinity
2d shapes
addition
indices
division
products
averages
angles
numbers
dates
arrows
trigonometry
money
regular shapes
triangles
even numbers
quadrilaterals
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