What day of the week is 14 May 1989?
Answer and explanation
Correct answer: B. Sunday
- Step 1: Determine odd days in completed periods up to 1988: the completed centuries up to 1900 contribute 1 odd days. The remaining 88 years contain 22 leap years and 66 ordinary years, giving .
- Step 2: Count elapsed days in 1989 up to 14 May: the total is 134 days, which equals .
- Step 3: Sum total odd days: . Code 0 corresponds to Sunday.
Answer
Sunday.
Why not the others: Thursday is code 4 (miscounting 4 odd days); Tuesday is code 2; Wednesday is code 3.
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