Class 11 Mathematics Permutations and Combinations Derivations of formulas and their connections Expert Level 66

(9) people को round table पर बैठाना है और (A) तथा (B) adjacent न हों। Count क्या है?

(9) people are seated around a round table and (A) and (B) are not adjacent. What is the count?

Explanation opens after your attempt
Correct Answer

A. \(8!-2\cdot7!\)

Step 1

Concept

Total circular arrangements are (8!) and the adjacent block gives \(2\cdot7!\) ways. In exams handle circular not-adjacent by complement.

Step 2

Why this answer is correct

The correct answer is A. \(8!-2\cdot7!\). Total circular arrangements are (8!) and the adjacent block gives \(2\cdot7!\) ways. In exams handle circular not-adjacent by complement.

Step 3

Exam Tip

Total circular arrangements (8!) हैं और adjacent block \(2\cdot7!\) ways देता है। परीक्षा में circular not-adjacent को complement से करें।

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(9) people को round table पर बैठाना है और (A) तथा (B) adjacent न हों। Count क्या है? / (9) people are seated around a round table and (A) and (B) are not adjacent. What is the count?

Correct Answer: A. \(8!-2\cdot7!\). Explanation: Total circular arrangements (8!) हैं और adjacent block \(2\cdot7!\) ways देता है। परीक्षा में circular not-adjacent को complement से करें। / Total circular arrangements are (8!) and the adjacent block gives \(2\cdot7!\) ways. In exams handle circular not-adjacent by complement.

Which concept should I revise for this Mathematics MCQ?

Total circular arrangements are (8!) and the adjacent block gives \(2\cdot7!\) ways. In exams handle circular not-adjacent by complement.

What exam hint can help solve this Mathematics question?

Total circular arrangements (8!) हैं और adjacent block \(2\cdot7!\) ways देता है। परीक्षा में circular not-adjacent को complement से करें।