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