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What day of the week was 28 May 2007?

AThursday
BFriday
CSaturday
DMonday ✓ Correct
Correct answer: (D) Monday
Explanation

28 May 2007 fell on a Monday.

Odd days = odd days of 2000 years + years 2001 to 2006 + days of 2007.

2000 years give 0; 2001 to 2006 have 5 ordinary + 1 leap = 5 + 2 = 7, i.e. 0 odd days.

Days to 28 May = 31 + 28 + 31 + 30 + 28 = 148, and 148 / 7 leaves 1.

Total odd days = 1, which counts to Monday.

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