The four sentences (labelled 1, 2, 3 and 4) given below, when properly sequenced, would yield a coherent paragraph. Decide on the proper sequencing of the order of the sentences and key in the sequence of the four numbers as your answer.
- Adding a single day every fourth year is the simple fix, and for a long stretch of European history that was the entire rule.
- It overcorrects a little, so the calendar slid by roughly three days every four centuries until a second rule was brought in to take them back.
- That rule drops the leap day in three century years out of every four, which is why the year 1900 had no twenty-ninth of February at all.
- A year is not a whole number of days, and the extra quarter of a day left over at the end has to be put somewhere.