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How many working days in year 1901?
Here is the detail of the calculation:
Because 1901 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 52 sundays. It remains 261 days.
Now, let's remove 8 public holidays that do not fall during a weekend and we obtain 253 working days in 1901.
 Here is the list of these 8 public holidays: 
 
 1. Capodanno : вівторок, 1 січень, 1901 
2. Lunedì di Pasqua : понеділок, 8 квітень, 1901 
3. Anniversario Liberazione : четвер, 25 квітень, 1901 
4. Festa del lavoro : середа, 1 травень, 1901 
5. Ferragosto o Assunzione : четвер, 15 серпень, 1901 
6. Ognissanti o Tutti i Santi : п'ятниця, 1 листопад, 1901 
7. Santo Natale : середа, 25 грудень, 1901 
8. Santo Stefano : четвер, 26 грудень, 1901 
And here are the 3 public holidays falling on a weekend:
1. Epifania : неділя, 6 січень, 1901 
2. Festa della Repubblica Italia : неділя, 2 червень, 1901 
3. Immacolata Concezione : неділя, 8 грудень, 1901