Question discussion

1st February 2009 is Sunday. In which year again 1st February will be Sunday?

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Number of odd days in 2009 = 1

Number of odd days from 2009 till 2010 = 1 + 1 = 2 odd days

Number of odd days from 2009 till 2011 = 2 + 1 = 3 odd days

Number of odd days from 2009 till 2012 = 3 + 2 = 5 odd days

Number of odd days from 2009 till 2013 = 5 + 1 = 6 odd days

Number of odd days from 2009 till 2014 = 6 + 1 = 7 odd days = 0 odd days

Hence, 1st February 2015 will be Sunday.