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