## Ismaiel Kalady is teaching live on Unacademy Plus

CALENDAR PROBLEMS PART 1 CONCEPT OF ODD DAYS & LEAP YEARS SHORTCUT TRICKS FOR DEGREE LEVEL PSC

Course Contents Basic Concepts of Calendar Based problems Leap years & Odd days Do not by heart any equations Different Types of Calendar Problems Previous year PSC Questions included

Leap and Ordinary year Ordinary year has 365 days (February 28 days) Leap year has 366 days (February 29 days) Every year which is exactly divisible by 4 is called a leap year. For a century to be a leap year, it should be exactly divisible by 400

Check Leap year or Ordinary Year 2016, 1992, 2012, 1996 ,etc.. are leap years Divisibility of 4 - check last 2 digits 2011, 2013, 1991, 1995 ,etc. are ordinary years 1200, 1600, 2000 are leap years Divisible with 400 .2100, 1700, 1300 are ordinary years

Odd Days An ordinary year has 365 days. If we divide 365 by 7, we get, 52 as quotient and 1 as remainder, This remainder left out is called odd day Therefore, an ordinary year has 1 odd day . A leap year has 366 days, i.e. 52 weeks and 2 days. Therefore, a leap year has 2 odd days.

Find odd days from numbers Odd days Remainder left after dividing with 7) Number of Days 10 15 28 0 30 31

Odd days in each month DecNov Mar Apr Oct MaySep eb un Ja Aug ul 31 2a29 28/2 3 3031 Jan Feb Mar Apr May June July Aug Sep Oct Nov Dec 3 0/1 32 3 2 3 3 2 3 23

Odd days between Years Difference b/w years+ no. of leap years 2001 to 2018 17 + Leap years (04,08,12,16) 17+4-21 odd days

Odd days between Years Difference b/w years+ no. of leap years 2001 to 2018 17 + Leap years (04,08,12,16) 1991 to 1999 8 + Leap Years (92, 96) 17+4-21 odd days 8+2 10 odd days

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