Advent calendar 2017

10 December

How many zeros does 1000! (ie 1000 × 999 × 998 × ... × 1) end with?

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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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