What day of the week is 18 September 2011?
Answer and explanation
Correct answer: B. Sunday
- Step 1: Determine odd days up to the completed year : years contribute odd days. The remaining years contain leap years and ordinary years, contributing days, or odd days.
- Step 2: Count the days elapsed in up to 18 September: there are days, which gives odd days.
- Step 3: Sum total odd days modulo 7: , which corresponds to Sunday (where ).
Answer
Sunday.
Why not the others: The remaining days of the week (Tuesday, Monday, Saturday) arise from miscounting leap years, omitting century odd days, or making month-day remainder slips.
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