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Advent calendar 2018

1 December

There are 5 ways to write 4 as the sum of 1s and 2s:
Today's number is the number of ways you can write 12 as the sum of 1s and 2s.

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Sunday Afternoon Maths LXVII

Coloured weights
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Advent calendar 2018

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Cryptic crossnumber #2

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Cryptic crossnumber #1
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Square and cube endings

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