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What was the day on 25th Jan,1981?

Correct Answer: Sunday

Explanation:

25 Jan, 1981 = (1980 years + Period from 1.1.1981 to 25.1.1981)


 


Odd days in 1600 years = 0


Odd days in 300 years = 1


80 years = (60 ordinary years + 20 leap year) = (60 x 1 + 20 x 2)= 2 odd days


Jan = 25 days = (3 weeks + 4 days) = 4 odd days.


 


Total number of odd days = (0 + 1 + 2 + 4) = 7= 0 odd day.


Given day is Sunday.


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