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How many working days in year 1968?
Here is the detail of the calculation:
Because 1968 is a leap year, it has 366 days.
Let's remove 52 saturdays and 52 sundays. It remains 262 days.
Now, let's remove 13 public holidays that do not fall during a weekend and we obtain 249 working days in 1968.
 Here is the list of these 13 public holidays: 
 
 1. Año Nuevo : Monday, 1 January, 1968 
2. Lunes de Carnaval : Monday, 26 February, 1968 
3. Martes de Carnaval : Tuesday, 27 February, 1968 
4. Jueves Santo : Thursday, 11 April, 1968 
5. Viernes Santo : Friday, 12 April, 1968 
6. Declaración de la Independencia : Friday, 19 April, 1968 
7. Día Internacional de los Trabajadores : Wednesday, 1 May, 1968 
8. Batalla de Carabobo : Monday, 24 June, 1968 
9. Conmemora de la Declaración de independencia nacional de Venezuela (5 de julio de 1811) : Friday, 5 July, 1968 
10. Natalicio del libertador Simón Bolívar : Wednesday, 24 July, 1968 
11. Nochebuena : Tuesday, 24 December, 1968 
12. Navidad : Wednesday, 25 December, 1968 
13. Nochevieja : Tuesday, 31 December, 1968 
And here are the 3 public holidays falling on a weekend:
1. Celebración de la constitución de un primer gobierno dentro del proceso de independencia nacional iniciado en la Revolución de Mayo. : Saturday, 25 May, 1968 
2. Día de San Pedro y San Pablo : Saturday, 29 June, 1968 
3. Día de la Resistencia Indígena : Saturday, 12 October, 1968