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Advent calendar 2015
5 December
All 2015 advent puzzles
~
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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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Most recent collections
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
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List of all puzzles
Tags
spheres
mean
matrices
circles
squares
prime numbers
multiplication
lines
menace
quadratics
routes
palindromes
consecutive numbers
albgebra
factorials
median
factors
digits
integers
folding tube maps
dominos
time
determinants
irreducible numbers
wordplay
tournaments
chess
colouring
division
star numbers
sum to infinity
rectangles
trigonometry
volume
digital clocks
bases
crosswords
hexagons
means
expansions
perfect numbers
differentiation
polynomials
products
shapes
money
percentages
cryptic clues
pascal's triangle
people maths
angles
the only crossnumber
quadrilaterals
algebra
coins
remainders
combinatorics
symmetry
pentagons
christmas
functions
cubics
speed
crossnumber
calculus
digital products
complex numbers
triangles
grids
logic
consecutive integers
addition
scales
odd numbers
dates
geometry
cards
doubling
geometric mean
proportion
even numbers
planes
rugby
games
triangle numbers
balancing
indices
probability
regular shapes
graphs
books
number
geometric means
axes
multiples
partitions
arrows
shape
square numbers
ellipses
probabilty
perimeter
dodecagons
polygons
square roots
dice
sums
chalkdust crossnumber
numbers
gerrymandering
ave
integration
sequences
2d shapes
chocolate
fractions
tangents
binary
parabolas
unit fractions
3d shapes
crossnumbers
cryptic crossnumbers
elections
cube numbers
sets
advent
clocks
tiling
decahedra
area
floors
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averages
sport
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