Question

On what dates of February, 2001 did Sunday fall ?
1. 1^st, 8^th, 15^th, 22^nd
2. 2^nd, 9^th, 16^th, 23^rd
3. 3^rd, 10^th, 17^th, 24^th
4. 4^th, 11^th, 18^th, 25^th

Answer 1

Correct Answer - Option 4 : 4^th, 11^th, 18^th, 25^th

We shall find the day on 1^st February, 2001.

Number of odd days in 100 years = 5

100 years = 76 ordinary years + 24 leap years

= 76

= 124

= 124/7

= 5

Number of odd days in 200 years = 10 = 3

Number of odd days in 300 years = 15 = 1

Number of odd days in 400 years = 21 = 0 ( 400 is leap year )

Number of odd days in 2000 years = 01^st February, 2001 = 2000 years + period from 1.1.2001 to 1.2.2001

1^st February, 2001 = 2000 years + 31 + 1 = 0 + 4

1^st February, 2001 was Thursday

So 4^th February, 2001 was Sunday

Hence, 4^th, 11^th, 18^th, 25^th of February, 2001 were Sunday.