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Advent calendar 2017
7 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 sum of the numbers in the seventh row?
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343
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numbers
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Archive
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Most recent collections
Advent calendar 2024
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
List of all puzzles
Tags
surds
taxicab geometry
3d shapes
square roots
functions
rectangles
routes
consecutive integers
prime numbers
floors
palindromes
geometry
quadrilaterals
logic
wordplay
dates
means
percentages
number
numbers grids
circles
decahedra
books
lines
algebra
elections
cube numbers
digital products
chalkdust crossnumber
dice
tangents
pentagons
powers
triangles
determinants
menace
addition
people maths
quadratics
trigonometry
squares
factors
irreducible numbers
graphs
parabolas
even numbers
axes
coordinates
ellipses
tournaments
geometric mean
division
binary
odd numbers
complex numbers
pascal's triangle
integers
cryptic clues
range
combinatorics
multiples
arrows
folding tube maps
time
sets
money
angles
crossnumbers
star numbers
numbers
clocks
chocolate
differentiation
square grids
indices
sport
averages
rugby
2d shapes
grids
cryptic crossnumbers
products
ave
regular shapes
perfect numbers
bases
dominos
digital clocks
geometric means
proportion
cards
coins
balancing
doubling
chess
expansions
neighbours
albgebra
advent
shape
probabilty
area
mean
the only crossnumber
polygons
sums
planes
polynomials
matrices
multiplication
integration
median
scales
dodecagons
crosswords
christmas
volume
remainders
unit fractions
hexagons
fractions
colouring
symmetry
spheres
medians
digits
speed
partitions
factorials
tiling
shapes
triangle numbers
probability
perimeter
square numbers
sum to infinity
cubics
consecutive numbers
gerrymandering
calculus
sequences
games
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