Maths · Permutations and combinations
5 boys are to be arranged in a row. It two particular boys desire to sit in end
5 boys are to be arranged in a row. It two particular boys desire to sit in end places, the number of possible arrangements is
- A. 60
- B. 120
- C. 240
- D. 12
Step-by-step solution
The two particular boys occupy the two end places in 2! = 2 ways. The remaining three boys can be arranged in the three middle positions in 3! = 6 ways. Total arrangements = 2 × 6 = 12.