On January 1, 2011 was Wednesday, what day of the week it on 1st Jan 2009? |
Tuesday Wednesday Thursday Monday |
Monday |
2009 and 2010 are ordinary year, so they have 1-1 odd days. So, the day on 1st Jan, 2009 will be 2 days beyond the day on 1st Jan 2011. 1st Jan 2011 was Wednesday Thus, 1st Jan 2009 will be "Monday". |