यदि necklace में clockwise और anticlockwise arrangements same मानी जाएं तो ((n-1)!) से आगे किससे divide किया जाता है?
If clockwise and anticlockwise arrangements are considered the same in a necklace, by what is ((n-1)!) further divided?
Explanation opens after your attempt
Correct Answer
B. (2)
Concept
When reflection is also same each circular arrangement is counted twice. In exams remember (\frac{(n-1)!}{2}) for necklace type.
Why this answer is correct
The correct answer is B. (2). When reflection is also same each circular arrangement is counted twice. In exams remember (\frac{(n-1)!}{2}) for necklace type.
Exam Tip
Reflection भी same होने पर हर circular arrangement दो बार गिनी जाती है। परीक्षा में necklace type में (\frac{(n-1)!}{2}) याद रखें।
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