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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
,
multiplication
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Most recent collections
Advent calendar 2024
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
List of all puzzles
Tags
circles
numbers grids
books
colouring
money
polynomials
decahedra
medians
angles
parabolas
dominos
chalkdust crossnumber
gerrymandering
sum to infinity
number
averages
multiples
star numbers
rectangles
products
neighbours
quadratics
prime numbers
elections
factors
pentagons
arrows
pascal's triangle
graphs
division
routes
means
coordinates
digits
binary
range
crosswords
cube numbers
partitions
matrices
trigonometry
irreducible numbers
lines
percentages
ave
triangles
tournaments
spheres
crossnumbers
hexagons
rugby
shape
perfect numbers
numbers
tiling
dice
cryptic crossnumbers
powers
calculus
remainders
dodecagons
indices
proportion
fractions
3d shapes
squares
determinants
addition
people maths
geometric mean
mean
polygons
advent
scales
christmas
perimeter
logic
sets
sequences
bases
consecutive numbers
functions
probability
probabilty
grids
complex numbers
shapes
cryptic clues
planes
games
sums
floors
regular shapes
multiplication
algebra
factorials
unit fractions
volume
menace
cubics
integration
ellipses
symmetry
consecutive integers
2d shapes
taxicab geometry
chocolate
area
dates
speed
tangents
digital products
clocks
palindromes
median
quadrilaterals
differentiation
the only crossnumber
expansions
sport
square roots
doubling
integers
folding tube maps
odd numbers
balancing
even numbers
axes
square grids
wordplay
square numbers
combinatorics
coins
chess
digital clocks
albgebra
cards
time
triangle numbers
geometric means
surds
geometry
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