\(^{n}P_r\) और \(^{n}P_{r-1}\) के बीच कौन-सा संबंध सही है?

Which relation between \(^{n}P_r\) and \(^{n}P_{r-1}\) is correct?

Explanation opens after your attempt
Correct Answer

B. \(^{n}P_r=^{n}P_{r-1}\times(n-r+1)\)

Step 1

Concept

For the (r)th position (n-r+1) choices are added as a factor. In exams identify the factor of the next position.

Step 2

Why this answer is correct

The correct answer is B. \(^{n}P_r=^{n}P_{r-1}\times(n-r+1)\). For the (r)th position (n-r+1) choices are added as a factor. In exams identify the factor of the next position.

Step 3

Exam Tip

(r)वें स्थान के लिए (n-r+1) विकल्प जुड़ते हैं। परीक्षा में next position का factor अलग पहचानें।

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Mathematics Answer, Explanation and Revision Hints

\(^{n}P_r\) और \(^{n}P_{r-1}\) के बीच कौन-सा संबंध सही है? / Which relation between \(^{n}P_r\) and \(^{n}P_{r-1}\) is correct?

Correct Answer: B. \(^{n}P_r=^{n}P_{r-1}\times(n-r+1)\). Explanation: (r)वें स्थान के लिए (n-r+1) विकल्प जुड़ते हैं। परीक्षा में next position का factor अलग पहचानें। / For the (r)th position (n-r+1) choices are added as a factor. In exams identify the factor of the next position.

Which concept should I revise for this Mathematics MCQ?

For the (r)th position (n-r+1) choices are added as a factor. In exams identify the factor of the next position.

What exam hint can help solve this Mathematics question?

(r)वें स्थान के लिए (n-r+1) विकल्प जुड़ते हैं। परीक्षा में next position का factor अलग पहचानें।