Permutation & Combination · Question 30 · Hard
Permutation & Combination question 30
Seven friends, including Tara and Uday, sit around a round table. Arrangements that differ only by rotation are the same. In how many arrangements do Tara and Uday NOT sit next to each other?
- 600
- 480
- 240
- 720
Answer and explanation
Answer: B. 480
Explanation: Total circular arrangements = (7 − 1)! = 720. With Tara and Uday together (as one unit, in 2 orders): 5! × 2 = 240. So 720 − 240 = 480.
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