Permutation & Combination · Question 10 · Medium
In how many ways can 6 people sit in a row if two particular friends, Aman and Bina, must sit together?
- 120
- 240
- 720
- 480
Answer and explanation
Answer: B. 240
Explanation: Treat Aman and Bina as one unit: 5! = 120 arrangements, and they can swap places in 2 ways: 120 × 2 = 240.
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