How well do you know the calendar? Can you calculate days if a date is given. Test your skills with this riddle.
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Answer:
We can calculate out how many days there will be for the 13th on each month if we count from the beginning of the year (January 1). Then we divide total days by 7 to get the remainders. We also need to consider the leap year. Through the whole year we had all kinds of remainders, from 0 to 6.
The minimum of occurrence for all the unique remainders was 1. It means that we have at least one Friday on 13th.
In a regular year, the best chance you can get 3 Fridays on 13th, which are in February, March and December because the remainders of these 3 months are 2. In a leap year, the best chance you also can get 3 Fridays on 13th, which are in January, April and July because the remainders of these 3 months are 6.
So answer is zero occurrence is not possible minimum 1 is there and the maximum Friday the 13th that we can have is 3.
