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Advent calendar 2015
5 December
All 2015 advent puzzles
~
More information
How many different triangles are there with a perimeter of 100 and each side having an integer length?
(different = not rotations or reflections)
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208
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triangles
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2d shapes
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routes
2d shapes
scales
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squares
mean
partitions
neighbours
lines
factors
gerrymandering
geometric mean
coins
folding tube maps
clocks
fractions
dates
chocolate
calculus
consecutive numbers
people maths
games
albgebra
volume
wordplay
number
money
means
cryptic crossnumbers
determinants
sport
quadratics
polygons
palindromes
planes
dodecagons
multiples
probability
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xor
grids
range
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tournaments
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shapes
tiling
bases
triangle numbers
angles
matrices
balancing
indices
percentages
digital products
chess
cryptic clues
perimeter
sets
speed
symmetry
crossnumbers
doubling
elections
triangles
even numbers
sequences
addition
hexagons
ave
unit fractions
decahedra
trigonometry
ellipses
averages
parabolas
the only crossnumber
integers
circles
remainders
regular shapes
dice
powers
products
square numbers
surds
dominos
graphs
arrows
lists
consecutive integers
axes
books
digital clocks
star numbers
square roots
taxicab geometry
medians
spheres
numbers
multiplication
multiplaction squares
cubics
polynomials
geometric means
sum to infinity
chalkdust crossnumber
differentiation
prime factors
time
shape
rectangles
rugby
division
irreducible numbers
pentagons
median
colouring
binary
algebra
perfect numbers
prime numbers
integration
proportion
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area
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