Question

which year has the same calendar as that of 2009? ​

Answer 1

Answer:

omg really is was like that sorry idk

Answer 2

Answer:

The day of the week of Jan 1 advances 1 day/year in common years and 2 days in leap years. The sequence of years repeats with a 28 year cycle assuming we do not hit a centennial year that is not a leap year. However, 3 common years in the 28 year cycle share a start day.

We look at the starting year mod 4, and assuming we don’t hit one of those non-leap centennial years we get the repeat pattern below

Start year mod 4, next repeat

0, 28 years

+1, 6 years

+2, 11 years

+3, 11 years

If the figures above result in crossing a nonleap centennial year (like 2100), instead use:

0, 40 years

+1, 12 years

+2, 12 years

+3, 6 years

2009 mod 4 = 1, so 2009 + 6 = 2015