What day of the week is 21 March 2021?
Answer and explanation
Correct answer: A. Sunday
- Step 1: Break down the elapsed period up to the target date 21 March 2021: completed years amount to 2020, consisting of 2000 century years and 20 additional years (5 leap years and 15 ordinary years).
- Step 2: Compute the odd days: 2000 century years contribute 0 odd days; 5 leap years contribute 10 days, and 15 ordinary years contribute 15 days. Adding the 80 days elapsed in 2021 gives the total day count.
- Step 3: Divide the cumulative count by to obtain the net odd days. The resulting remainder corresponds uniquely to Sunday.
Answer
Sunday.
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