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

(8) people को round table पर बैठाना है और (A) तथा (B) adjacent न हों। Count कौन-सी है?

(8) 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. \(7!-2\cdot6!\)

Step 1

Concept

Total circular arrangements are (7!), and the adjacent block occurs in \(2\cdot6!\) ways. In exams handle circular not-adjacent by complement.

Step 2

Why this answer is correct

The correct answer is A. \(7!-2\cdot6!\). Total circular arrangements are (7!), and the adjacent block occurs in \(2\cdot6!\) ways. In exams handle circular not-adjacent by complement.

Step 3

Exam Tip

Total circular arrangements (7!) हैं और adjacent block \(2\cdot6!\) ways में आता है। परीक्षा में circular not adjacent को complement से करें।

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(8) people को round table पर बैठाना है और (A) तथा (B) adjacent न हों। Count कौन-सी है? / (8) people are seated around a round table and (A) and (B) are not adjacent. Which count is correct?

Correct Answer: A. \(7!-2\cdot6!\). Explanation: Total circular arrangements (7!) हैं और adjacent block \(2\cdot6!\) ways में आता है। परीक्षा में circular not adjacent को complement से करें। / Total circular arrangements are (7!), and the adjacent block occurs in \(2\cdot6!\) ways. In exams handle circular not-adjacent by complement.

Which concept should I revise for this Mathematics MCQ?

Total circular arrangements are (7!), and the adjacent block occurs in \(2\cdot6!\) ways. In exams handle circular not-adjacent by complement.

What exam hint can help solve this Mathematics question?

Total circular arrangements (7!) हैं और adjacent block \(2\cdot6!\) ways में आता है। परीक्षा में circular not adjacent को complement से करें।