(10) अलग-अलग वस्तुओं में से (4) को एक पंक्ति में सजाना है, लेकिन दो विशेष वस्तुएँ दोनों एक साथ चुनी जाएँ या दोनों न चुनी जाएँ। कुल क्रम कितने हैं?
From (10) distinct objects, (4) are to be arranged in a row, but two particular objects must either both be selected or both not be selected. How many arrangements are possible?
Explanation opens after your attempt
C. (4368)
Concept
If both are selected, count \(8C2\cdot4!\); if both are not selected, count \(8C4\cdot4!\). Split such problems into cases and add.
Why this answer is correct
The correct answer is C. (4368). If both are selected, count \(8C2\cdot4!\); if both are not selected, count \(8C4\cdot4!\). Split such problems into cases and add.
Exam Tip
दोनों चुने जाने पर \(8C2\cdot4!\) और दोनों न चुने जाने पर \(8C4\cdot4!\) मिलते हैं। ऐसे प्रश्नों में cases अलग करके जोड़ें।
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