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How many working days in year 1950?
Here is the detail of the calculation:
Because 1950 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 53 sundays. It remains 260 days.
Now, let's remove 7 public holidays that do not fall during a weekend and we obtain 253 working days in 1950.
 Here is the list of these 7 public holidays: 
 
 1. Goede Vrijdag : Friday, 7 April, 1950 
2. Tweede Paasdag : Monday, 10 April, 1950 
3. Bevrijdingsdag : Friday, 5 May, 1950 
4. Hemelvaartsdag : Thursday, 18 May, 1950 
5. Tweede Pinksterdag : Monday, 29 May, 1950 
6. Eerste Kerstdag : Monday, 25 December, 1950 
7. Tweede Kerstdag : Tuesday, 26 December, 1950 
And here are the 4 public holidays falling on a weekend:
1. Nieuwjaar : Sunday, 1 January, 1950 
2. Eerste Paasdag : Sunday, 9 April, 1950 
3. Koninginnedag : Saturday, 29 April, 1950 
4. Eerste Pinksterdag : Sunday, 28 May, 1950