On what day did 31 December 2000 fall, if 1 January 2000 was Saturday?
Sunday
The year 2000 is a leap year since it is divisible by 400, so it has 366 days.
The number of days between 1 January and 31 December in the same year is \(366 - 1 = 365\).
Finding the day shift requires computing \(365 \mod 7\), which equals \(1\).
Adding one day to Saturday gives Sunday.
Hence, 31 December 2000 fell on a Sunday.
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