What will be the day of the week 15th August, 2010?
15th August, 2010 = 2009 years + Period 1.1.2010 to 15.8.2010
Odd days in 1600 years = 0
Odd days in 400 years = 0
9 years = 2 leap years + 7 ordinary years = $(2 \times 2 + 7 \times 1)$ = 11 odd days $\equiv$ 4 odd days.
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