Question 138

What was the day of the week on 30 Sep 2010?

Solution

Number of odd days till 2000 is 0.

Number of odd days from 2001 to 2009 is 10( 2 leap years +6 normal years).

Number of odd days in 2010 till sept 10 is (31+28+31+30+31+30+31+31+30 = 274) 274

Total odd days is 274+10=284%7=4.

So, the day is thursday.

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