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