mscroggs
.co.uk
mscroggs
.co.uk
blog
puzzles
academic
talks
contact
subscribe
↓ ☰ ↓
subscribe
Loading image...
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?
Show answer
Hide answer
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
.
Tags:
numbers
Archive
Show me a random puzzle
Most recent collections
Advent calendar 2024
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
List of all puzzles
Tags
books
tournaments
lines
polynomials
integers
complex numbers
gerrymandering
decahedra
hexagons
square roots
factorials
wordplay
multiplication
division
matrices
irreducible numbers
cubics
range
percentages
chocolate
digital products
powers
cards
even numbers
triangle numbers
axes
square numbers
tangents
rugby
christmas
money
star numbers
games
cryptic clues
averages
fractions
clocks
polygons
neighbours
digital clocks
surds
grids
prime numbers
differentiation
parabolas
expansions
numbers
folding tube maps
palindromes
sequences
shapes
3d shapes
speed
dates
sums
probabilty
mean
logic
elections
unit fractions
sum to infinity
median
rectangles
triangles
algebra
consecutive numbers
addition
doubling
scales
perfect numbers
squares
integration
geometric mean
sport
people maths
colouring
spheres
consecutive integers
symmetry
geometry
quadrilaterals
2d shapes
medians
number
sets
partitions
binary
coordinates
dominos
taxicab geometry
calculus
products
time
means
numbers grids
graphs
balancing
cryptic crossnumbers
proportion
tiling
square grids
coins
quadratics
crosswords
pentagons
area
bases
odd numbers
chess
advent
cube numbers
the only crossnumber
digits
volume
albgebra
factors
planes
floors
perimeter
ave
pascal's triangle
ellipses
remainders
crossnumbers
trigonometry
indices
functions
regular shapes
shape
dice
dodecagons
combinatorics
arrows
angles
chalkdust crossnumber
determinants
circles
geometric means
multiples
routes
probability
menace
Archive
Show me a random puzzle
▼ show ▼
▲ hide ▲
Most recent collections
Advent calendar 2024
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
List of all puzzles
Tags
numbers
circles
chalkdust crossnumber
geometric mean
cube numbers
probability
clocks
triangles
number
combinatorics
integers
geometric means
coordinates
expansions
sum to infinity
games
albgebra
quadratics
dice
neighbours
square numbers
factors
powers
consecutive integers
triangle numbers
addition
hexagons
grids
quadrilaterals
consecutive numbers
complex numbers
calculus
trigonometry
digits
pentagons
colouring
functions
dodecagons
averages
rugby
irreducible numbers
floors
pascal's triangle
chocolate
factorials
ave
wordplay
dominos
scales
multiples
sport
axes
dates
ellipses
fractions
sums
perfect numbers
doubling
means
proportion
odd numbers
mean
matrices
menace
elections
angles
shapes
remainders
determinants
algebra
arrows
time
sets
folding tube maps
range
speed
chess
polynomials
partitions
people maths
taxicab geometry
money
square roots
squares
regular shapes
volume
square grids
the only crossnumber
sequences
spheres
tiling
symmetry
coins
planes
2d shapes
cryptic clues
parabolas
crosswords
tangents
differentiation
geometry
books
gerrymandering
routes
lines
integration
digital clocks
area
surds
indices
multiplication
median
binary
prime numbers
products
unit fractions
probabilty
crossnumbers
numbers grids
division
star numbers
cryptic crossnumbers
medians
bases
shape
3d shapes
graphs
decahedra
cubics
palindromes
christmas
rectangles
polygons
balancing
percentages
advent
logic
tournaments
perimeter
even numbers
digital products
cards
© Matthew Scroggs 2012–2025