Answer: 4!.
- A 4!
- B 5!
- C 3!
- D 120
Correct answer: A. 4!
Explanation: A fixed in position 1. Remaining 4 can be arranged in 4! = 24 ways.
Counting tree for selecting 2 items from {A, B, C} without repetition: 3 x 2 = 6 ordered arrangements.
Concept context
Counting, arrangements, and selections