中等MATH-PROB-006
In how many ways can 5 distinct books be arranged in a row?
A. 5
B. 25
C. 60
D. 120✓ 答案
解說
Order matters and every book is used, so the count is 5! = 120. The value 60 divides by an extra 2 that the question does not require.
Order matters and every book is used, so the count is 5! = 120. The value 60 divides by an extra 2 that the question does not require.