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

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

We shall find the day on 1st 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 = 01st February, 2001 = 2000 years + period from 1.1.2001 to 1.2.2001

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

1st February, 2001 was Thursday

So 4th February, 2001 was Sunday

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

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