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Advent calendar 2017
21 December
All 2017 advent puzzles
~
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The factors of 6 (excluding 6 itself) are 1, 2 and 3. \(1+2+3=6\), so 6 is a
perfect number
.
Today's number is the only three digit perfect number.
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496
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squares
hexagons
angles
3d shapes
surds
books
rugby
median
prime factors
xor
area
unit fractions
crossnumbers
determinants
tiling
complex numbers
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axes
gerrymandering
sum to infinity
scales
dominos
calculus
volume
chalkdust crossnumber
partitions
averages
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fractions
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proportion
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perimeter
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integers
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neighbours
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pascal's triangle
means
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even numbers
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