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10 most difficult math­e­mat­ics riddles

A list of ten (out of 91) mathematics related questions that are the most often answered incorrectly
Mathematics quiz
Augustus was born on 1 January 10BC. Which birthday did he celebrate at 1 January 10AD?
19
20
21
80
There was no year number zero. There were only 1999 years between 1000BC and 1000AD.
Gizem İsmailoğlu
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0
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5
Very interesting!
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