What day of the week is 6 October 2003?
Answer and explanation
Correct answer: C. Monday
- 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 6 October: there are days, which gives odd days.
- Step 3: Sum total odd days modulo 7: , which corresponds to Monday (where ).
Answer
Monday.
Why not the others: The remaining days of the week (Sunday, Saturday, Tuesday) arise from miscounting leap years, omitting century odd days, or making month-day remainder slips.
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