Answer: 11!/(4!4!2!).
- A 11!
- B 11!/(4!4!2!)
- C 11!/(4!4!)
- D 11!/4!
Correct answer: B. 11!/(4!4!2!)
Explanation: MISSISSIPPI: 11 letters. M=1, I=4, S=4, P=2. Arrangements = 11!/(1!4!4!2!).
Counting tree for selecting 2 items from {A, B, C} without repetition: 3 x 2 = 6 ordered arrangements.
Concept context
Counting, arrangements, and selections