(7) distinct beads को bracelet में arrange करने पर (\frac{(7-1)!}{2}) क्यों आता है?
Why does arranging (7) distinct beads in a bracelet give (\frac{(7-1)!}{2})?
Explanation opens after your attempt
A. Rotation और reflection दोनों same माने जाते हैंBoth rotation and reflection are considered the same
Concept
After removing circular duplicates, mirror images are also the same. In exams divide by (2) for reflection in bracelet problems.
Why this answer is correct
The correct answer is A. Rotation और reflection दोनों same माने जाते हैं / Both rotation and reflection are considered the same. After removing circular duplicates, mirror images are also the same. In exams divide by (2) for reflection in bracelet problems.
Exam Tip
Circular duplicates हटाने के बाद mirror images भी same हैं। परीक्षा में bracelet में necklace की तरह reflection by (2) divide करें।
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