51. Each of 6 historical events occurred in a different year. You are asked to arrange the 6 events in ascending order by the years they occurred. You know the earliest and the latest. You randomly order the other events. What is the probability that you order the 6 events correctly?

Answer and Explanation

Your Answer is

Correct Answer is C

Explanation

According to the question stem, the sequence of 4 events is uncertain. According to the principle of permutation and combination, it can be seen that there are 4×3×2×1=24 situations in total. And only one is correct. So C is correct.