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27 CHAP - 27 CALENDAR IMPORTANT FACTS AND FOAMULAE Under...

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27. CALENDAR IMPORTANT FACTS AND FOAMULAE Under this heading we mainly deal with finding the day of the week on a particular given date the process of finding it lies on obtaining the number of odd days. Odd Days : Number of days more than the complete number of weeks in a given Period ., is the number of odd days during that period. LeapYear: Every year which is divisible by 4 is called a leap year. Thus each one of the years 1992, 1996, 2004, 2008, 2012, etc. is a leap year. Every 4th century is a leap year but no other century is a leap year.thus each one of 400, 800, 1200,' 1600, 2000, etc. is a leap year. None of 1900, 2010, 2020, 2100, etc. is a leap year. An year which is not a leap year is called an ordinary year. (I )An ordinary year has 365 days. (II) A leap year has 366 days. Counting of Odd Days : i)1 ordinary year = 365 days = (52 weeks + 1 day). :. An ordinary year has 1 odd day. ii)1 leap year = 366 days = (52 weeks + 2 days). :. A leap year has 2 odd days. _ iii)100 years = 76 ordinary years + 24 leap years = [(76 x 52) weeks + 76 days) + [(24 x 52) weeks + 48 days] = 5200 weeks + 124 days = (5217 weeks + 5 days).
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