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Advent calendar 2015

9 December

You start at A and are allowed to move either to the right or upwards.
How many different routes are there to get from A to B?

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Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

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