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Advent calendar 2017
8 December
All 2017 advent puzzles
~
More information
The odd numbers are written in a pyramid.
1
3
5
7
9
11
etc.
What is the mean of the numbers in the 23rd row?
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529
Tags:
numbers
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xor
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sum to infinity
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balancing
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even numbers
odd numbers
symmetry
mean
coins
dominos
crossnumbers
division
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colouring
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consecutive integers
people maths
chocolate
percentages
sport
speed
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gerrymandering
proportion
cubics
tiling
angles
geometry
addition
complex numbers
wordplay
geometric mean
functions
prime numbers
medians
graphs
shape
advent
menace
means
multiplaction squares
algebra
fractions
neighbours
palindromes
triangle numbers
partitions
digital clocks
volume
numbers
powers
square numbers
polynomials
range
logic
dice
christmas
3d shapes
floors
chalkdust crossnumber
crosswords
money
elections
Archive
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Most recent collections
Advent calendar 2025
Advent calendar 2024
Advent calendar 2023
Advent calendar 2022
List of all puzzles
Tags
doubling
numbers
cube numbers
bases
multiplication
chocolate
median
digits
integers
xor
functions
geometry
consecutive integers
rugby
advent
combinatorics
planes
clocks
matrices
dodecagons
palindromes
factors
determinants
remainders
addition
products
dice
elections
sport
spheres
christmas
graphs
even numbers
ellipses
range
logic
probability
mean
crosswords
lines
dominos
indices
cryptic clues
sequences
money
chalkdust crossnumber
calculus
quadrilaterals
parabolas
fractions
area
grids
hexagons
circles
partitions
2d shapes
binary
arrows
number
shape
coordinates
gerrymandering
taxicab geometry
perfect numbers
integration
chess
the only crossnumber
regular shapes
unit fractions
axes
scales
angles
proportion
means
prime numbers
menace
quadratics
probabilty
books
odd numbers
digital products
speed
games
sums
rectangles
symmetry
powers
polygons
albgebra
multiplaction squares
squares
pascal's triangle
triangle numbers
square grids
wordplay
consecutive numbers
star numbers
geometric mean
people maths
cryptic crossnumbers
complex numbers
multiples
expansions
routes
volume
lists
differentiation
sum to infinity
ave
surds
algebra
colouring
square numbers
folding tube maps
geometric means
pentagons
prime factors
division
coins
triangles
cubics
floors
dates
percentages
neighbours
tournaments
cards
medians
irreducible numbers
trigonometry
digital clocks
time
factorials
3d shapes
decahedra
square roots
tiling
perimeter
crossnumbers
tangents
sets
polynomials
averages
shapes
balancing
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