Discussion
It was Sunday on Jan 1, 2006. What was the day of the week Jan 1, 2010 ?
Answer: B
Only the remainder on division by 7 matters - the odd days.
Count the odd days from 1 January 2006 to 1 January 2010.
\[ 2006:1, \quad 2007:1, \quad 2008:2 \text{ (leap)}, \quad 2009:1 \]
\[ \text{total} = 5 \text{ odd days} \]
\[ \text{Sunday} + 5 = \textbf{Friday} \]
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