(8) अलग-अलग पुस्तकों की शेल्फ व्यवस्था में तीन विशेष पुस्तकें सभी साथ न रहें, ऐसी कितनी व्यवस्थाएं हैं?
In shelf arrangements of (8) distinct books, how many arrangements have three particular books not all together?
Explanation opens after your attempt
C. (36000)
Concept
Subtract the cases where all three are together, \(6!\cdot 3!\), from the total (8!). For not-all-together conditions, subtract bad cases from total.
Why this answer is correct
The correct answer is C. (36000). Subtract the cases where all three are together, \(6!\cdot 3!\), from the total (8!). For not-all-together conditions, subtract bad cases from total.
Exam Tip
कुल (8!) में से तीनों साथ वाली \(6!\cdot 3!\) व्यवस्थाएं घटती हैं। न-एक-साथ में कुल से खराब केस घटाएं।
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