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