What was the day of the week on 2nd January 2010, if it was Sunday on 1st January 2006?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Saturday
The weekday repeats every 7 days, so only the odd days, the days left over after whole weeks, move it forward. An ordinary year of 365 days is 52 weeks + 1 day, so it gives 1 odd day; a leap year of 366 days gives 2 odd days. Starting from Sunday, 1st January 2006:
2006 is an ordinary year, 1 odd day: 1st January 2007 is Sunday + 1 = Monday
2007 is an ordinary year, 1 odd day: 1st January 2008 is Monday + 1 = Tuesday
2008 is a leap year, 2 odd days: 1st January 2009 is Tuesday + 2 = Thursday
2009 is an ordinary year, 1 odd day: 1st January 2010 is Thursday + 1 = Friday
2nd January 2010 is the next day: Saturday
Tip: The question asks for 2nd January, not 1st January. Friday in Option (4) is the day of 1st January 2010; add one more day.