Question

Prove that the calender for 1990 will be same for 2001 also.

Answer 1

It is clear that the calender for 1990 will be serve for 2001 if first January of both the years is the same weekdays For that the number of odd days between 31st December 1989 and 31st December 2000 must be zero Odd days are as given below

Year 1990 1991 1992 1993 1994

Odd days 1 1 (Leap) 1 1

2

1995 1996 1997 1998 1999 2000

1 (Leap) 1 1 1 (Leap)

2 2

Total number of odd days= 14 days= 2 weeks +0 odd days