Class 11 Mathematics Permutations and Combinations Derivations of formulas and their connections Hard Level 65

(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
Correct Answer

A. Rotation और reflection दोनों same माने जाते हैंBoth rotation and reflection are considered the same

Step 1

Concept

After removing circular duplicates, mirror images are also the same. In exams divide by (2) for reflection in bracelet problems.

Step 2

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.

Step 3

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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(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})?

Correct Answer: A. Rotation और reflection दोनों same माने जाते हैं / Both rotation and reflection are considered the same. Explanation: Circular duplicates हटाने के बाद mirror images भी same हैं। परीक्षा में bracelet में necklace की तरह reflection by (2) divide करें। / After removing circular duplicates, mirror images are also the same. In exams divide by (2) for reflection in bracelet problems.

Which concept should I revise for this Mathematics MCQ?

After removing circular duplicates, mirror images are also the same. In exams divide by (2) for reflection in bracelet problems.

What exam hint can help solve this Mathematics question?

Circular duplicates हटाने के बाद mirror images भी same हैं। परीक्षा में bracelet में necklace की तरह reflection by (2) divide करें।