(8) अलग पुस्तकों को पंक्ति में सजाना है। दो निश्चित पुस्तकें साथ-साथ हों और तीसरी निश्चित पुस्तक पंक्ति के किसी सिरे पर हो। कुल कितनी व्यवस्थाएँ होंगी?
(8) distinct books are to be arranged in a row. Two particular books must be together, and a third particular book must be at one end of the row. How many arrangements are possible?
Explanation opens after your attempt
Correct Answer
A. (1440)
Concept
The third book has (2) end choices, and the two adjacent books are treated as a block with the remaining objects. Count the (2!) internal orders of the block too.
Why this answer is correct
The correct answer is A. (1440). The third book has (2) end choices, and the two adjacent books are treated as a block with the remaining objects. Count the (2!) internal orders of the block too.
Exam Tip
तीसरी पुस्तक के लिए (2) सिरों का चुनाव है, और दो साथ वाली पुस्तकों को ब्लॉक मानकर बाकी वस्तुएँ सजती हैं। ब्लॉक के भीतर (2!) क्रम भी गिनें।
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