(9) अलग-अलग मोतियों की माला कितने तरीकों से बनाई जा सकती है यदि घुमाने और पलटने पर मालाएं समान मानी जाएं?
In how many ways can a necklace be made using (9) distinct beads if rotations and reflections are considered identical?
Explanation opens after your attempt
A. (20160)
Concept
For a necklace, the count is ((9-1)!/2) because both rotation and reflection are identical. Remember the difference between circular seating and necklaces.
Why this answer is correct
The correct answer is A. (20160). For a necklace, the count is ((9-1)!/2) because both rotation and reflection are identical. Remember the difference between circular seating and necklaces.
Exam Tip
माला में संख्या ((9-1)!/2) होती है क्योंकि घूर्णन और प्रतिबिंब दोनों समान माने जाते हैं। गोल मेज और माला के अंतर को याद रखें।
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