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