If 6 March 2005 is a Monday, then what day of the week was 6 March 2004?
The year 2004 is a leap year. So, it has 2 odd days.
But, Feb 2004 not included because we are calculating from March 2004 to March 2005. So it has 1 odd day only.
 The day on 6th March, 2005 will be 1 day beyond the day on 6th March, 2004.
Given that, 6th March, 2005 is Monday.
Therefore, 6th March, 2004 is Sunday (1 day before to 6th March, 2005).
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