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Advent calendar 2021
15 December
All 2021 advent puzzles
~
More information
The odd numbers are written in a pyramid.
(row 1)
1
(row 2)
3
5
(row 3)
7
9
11
etc.
What is the mean of the numbers in the 19th row?
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The mean of the numbers in the \(n\)th row is \(n^2\), so the mean of the number in the 19th row is
361
.
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Tags
matrices
chocolate
the only crossnumber
sets
sum to infinity
complex numbers
multiples
tournaments
median
chess
cube numbers
digits
decahedra
probability
mean
area
crosswords
averages
square roots
advent
quadratics
star numbers
factorials
angles
probabilty
combinatorics
geometric means
remainders
colouring
dates
number
scales
trigonometry
ellipses
cards
shapes
products
shape
consecutive integers
logic
surds
pascal's triangle
chalkdust crossnumber
palindromes
games
odd numbers
christmas
consecutive numbers
graphs
lines
factors
geometry
indices
sport
menace
perimeter
gerrymandering
addition
quadrilaterals
volume
hexagons
prime numbers
coins
multiplication
proportion
time
sums
digital products
3d shapes
expansions
cubics
algebra
triangles
unit fractions
money
folding tube maps
sequences
range
functions
division
binary
fractions
integers
albgebra
routes
elections
bases
coordinates
crossnumbers
axes
irreducible numbers
calculus
percentages
numbers
polynomials
clocks
symmetry
circles
integration
books
square numbers
squares
rugby
dice
cryptic clues
dominos
people maths
doubling
speed
even numbers
differentiation
ave
grids
partitions
means
parabolas
spheres
regular shapes
triangle numbers
pentagons
2d shapes
digital clocks
taxicab geometry
balancing
tangents
floors
perfect numbers
tiling
crossnumber
wordplay
arrows
polygons
determinants
dodecagons
rectangles
planes
cryptic crossnumbers
geometric mean
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