(8) अलग-अलग वस्तुओं को वृत्त में कितने तरीकों से रखा जाए ताकि एक विशेष वस्तु दो दी गई वस्तुओं के बीच न हो?
In how many ways can (8) distinct objects be arranged in a circle so that one particular object is not between two given objects?
Explanation opens after your attempt
A. (4320)
Concept
Total circular arrangements are (7!). If the particular object has the two given objects as neighbours, they can be placed around it in (2!) ways and the rest in (5!) ways. The answer is (5040-240=4800).
Why this answer is correct
The correct answer is A. (4320). Total circular arrangements are (7!). If the particular object has the two given objects as neighbours, they can be placed around it in (2!) ways and the rest in (5!) ways. The answer is (5040-240=4800).
Exam Tip
कुल गोल व्यवस्थाएं (7!) हैं। विशेष वस्तु के दोनों पड़ोसी वे दो दी गई वस्तुएं हों तो उन्हें विशेष वस्तु के पास (2!) तरीकों से रखकर बाकी (5!) तरीके मिलते हैं। उत्तर (5040-240=4800) है।
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