(10) लोगों की पंक्ति में दो विशेष व्यक्ति हमेशा साथ रहें तो व्यवस्थाएं कितनी होंगी?
In a row of (10) people, how many arrangements are possible if two particular people always stay together?
Explanation opens after your attempt
B. (725760)
Concept
Treat the two particular people as one block, then \(9!\cdot2!=725760\). In exams, include the internal arrangement of the block.
Why this answer is correct
The correct answer is B. (725760). Treat the two particular people as one block, then \(9!\cdot2!=725760\). In exams, include the internal arrangement of the block.
Exam Tip
दो विशेष व्यक्तियों को एक ब्लॉक मानें, तब \(9!\cdot2!=725760\)। परीक्षा में साथ रहने की शर्त में block के अंदर की व्यवस्था भी लें।
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