Calendar questions majorly focuses on finding the day of a week of a perticular date. Some important terms used in calendar problems : 1. odd days - means number of days more than the complete number of weeks in a given period. 2. leap year - a year which is divisible by 4 . Every 4th century is a leap year but not other century years which are divisible by 4. Eg : 400 is a leap year but not 500. 3. An ordinary year has 365 days where as leap year has 366 days.
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