(8) व्यक्तियों को वृत्ताकार बैठाना है। दो निश्चित व्यक्ति साथ बैठें, पर तीसरा निश्चित व्यक्ति उन दोनों में से किसी के पास न बैठे। कुल कितनी व्यवस्थाएँ होंगी?
(8) persons are to be seated around a circle. Two particular persons must sit together, but a third particular person must not sit next to either of them. How many arrangements are possible?
Explanation opens after your attempt
Correct Answer
C. (960)
Concept
Treat the two adjacent persons as a block and subtract cases where the third person is adjacent to that block. In circular arrangements, fix one rotation.
Why this answer is correct
The correct answer is C. (960). Treat the two adjacent persons as a block and subtract cases where the third person is adjacent to that block. In circular arrangements, fix one rotation.
Exam Tip
दो साथ बैठने वालों को ब्लॉक मानें और फिर तीसरे व्यक्ति के पास बैठने वाले मामले घटाएँ। वृत्त में एक घुमाव को स्थिर मानना जरूरी है।
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