Class 11 Mathematics Permutations and Combinations Derivations of formulas and their connections Expert Level 64

(n) people को round table पर बैठाने में (A) और (B) adjacent न हों, तो count कौन-सी है?

If (n) people are seated around a round table and (A) and (B) are not adjacent, which count is correct?

Explanation opens after your attempt
Correct Answer

A. ((n-1)!-2(n-2)!)

Step 1

Concept

Subtract adjacent block arrangements of (A,B) from total circular arrangements. In exams handle circular not-adjacent by complement.

Step 2

Why this answer is correct

The correct answer is A. ((n-1)!-2(n-2)!). Subtract adjacent block arrangements of (A,B) from total circular arrangements. In exams handle circular not-adjacent by complement.

Step 3

Exam Tip

Total circular arrangements से (A,B) adjacent block के arrangements घटते हैं। परीक्षा में circular not adjacent को complement से करें।

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(n) people को round table पर बैठाने में (A) और (B) adjacent न हों, तो count कौन-सी है? / If (n) people are seated around a round table and (A) and (B) are not adjacent, which count is correct?

Correct Answer: A. ((n-1)!-2(n-2)!). Explanation: Total circular arrangements से (A,B) adjacent block के arrangements घटते हैं। परीक्षा में circular not adjacent को complement से करें। / Subtract adjacent block arrangements of (A,B) from total circular arrangements. In exams handle circular not-adjacent by complement.

Which concept should I revise for this Mathematics MCQ?

Subtract adjacent block arrangements of (A,B) from total circular arrangements. In exams handle circular not-adjacent by complement.

What exam hint can help solve this Mathematics question?

Total circular arrangements से (A,B) adjacent block के arrangements घटते हैं। परीक्षा में circular not adjacent को complement से करें।