How many total days were there in the years 2001 through 2004?
To answer this question, I need to recall how many days are in a regular year and how many days are in a leap year. A regular year has 365 days, and a leap year has 366 days. Leap years occur every four years, except for years that are divisible by 100 but not by 400. For example, the year 2000 was a leap year, but the year 2100 will not be a leap year. The years 2001, 2002, and 2003 were regular years, and the year 2004 was a leap year. To find the total number of days in these four years, I can add up the days in each year: 365 + 365 + 365 + 366 = 1461. 