(9) अलग-अलग मोतियों की माला बनानी है। पलटकर समान मानी जाने वाली मालाओं की संख्या कितनी होगी?
A necklace is made using (9) distinct beads. If flipped necklaces are considered identical, how many necklaces are possible?
Explanation opens after your attempt
A. (20160)
Concept
For a necklace, both rotation and reflection are identical, so the count is (\frac{(9-1)!}{2}). Exam tip: remember the difference between circular arrangements and necklaces.
Why this answer is correct
The correct answer is A. (20160). For a necklace, both rotation and reflection are identical, so the count is (\frac{(9-1)!}{2}). Exam tip: remember the difference between circular arrangements and necklaces.
Exam Tip
माला में घूर्णन और पलटना दोनों समान होते हैं, इसलिए संख्या (\frac{(9-1)!}{2}) है। परीक्षा में circular और necklace में अंतर याद रखें।
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