If 1st January 2001 was Monday. Then which day of week was it on 31 December 2001?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Monday
The weekday repeats every 7 days, so only the odd days left over after whole weeks move it forward.
2001 is not a leap year (2001 is not divisible by 4), so it has 365 days
31 December is the 365th day, so it comes 364 days after 1 January
\(364=52\times7\), that is, 52 whole weeks with no odd day, so the weekday is unchanged: Monday
Tip: In an ordinary (non-leap) year, the last day of the year falls on the same weekday as the first; in a leap year it falls one weekday later.