What day of the week is 28 December 2007?
Answer and explanation
Correct answer: D. Friday
- Step 1: Determine odd days in completed periods up to 2006: the completed centuries up to 2000 contribute 0 odd days. The remaining 6 years contain 1 leap years and 5 ordinary years, giving .
- Step 2: Count elapsed days in 2007 up to 28 December: the total is 362 days, which equals .
- Step 3: Sum total odd days: . Code 5 corresponds to Friday.
Answer
Friday.
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