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