Some people believe that January 1, 2000 is the first day of the 21st century. Other people believe that the honor belongs to January 1, 2001. But everyone should agree that January 1, 2002 is the first "sum-day" of the new century- when you write out that date in standard notation, it becomes 01/01/02, and 1+1=2. More generally, a sum-day is a date in which the day and month add up to the year. With that in mind:

A) What is the last sum-day of the 21st century?

B) How many sum-days are there in the 21st century?

• 30/12/42
  this would be the last sum day of 21st centuary
  as sum of date and month cannot exceed 42
  also it would be in first 100 yrs as after 2099 it would be 2100 and then we can not write 1/1/01 we have to write 1/1/2101 so year feild would require 3 digits and sum day is out of bound
  
• 11 years agoHelpfull: Yes(0) No(0)