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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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Tags
triangle numbers
even numbers
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numbers
folding tube maps
shapes
tiling
the only crossnumber
colouring
number
perimeter
menace
albgebra
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ave
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square roots
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time
addition
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irreducible numbers
volume
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dice
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factors
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angles
bases
taxicab geometry
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determinants
cryptic clues
books
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gerrymandering
dodecagons
scales
2d shapes
functions
trigonometry
remainders
complex numbers
polygons
palindromes
routes
triangles
floors
proportion
multiples
range
prime numbers
digital clocks
sequences
ellipses
crosswords
balancing
people maths
cubics
quadratics
pentagons
tangents
averages
rectangles
integers
3d shapes
pascal's triangle
speed
spheres
dominos
rugby
grids
coins
unit fractions
cards
square numbers
digits
axes
combinatorics
means
star numbers
perfect numbers
hexagons
probabilty
products
probability
cube numbers
expansions
chalkdust crossnumber
fractions
squares
polynomials
sets
graphs
geometry
area
regular shapes
decahedra
christmas
chocolate
clocks
coordinates
percentages
money
digital products
shape
partitions
consecutive numbers
sport
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odd numbers
cryptic crossnumbers
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