\(^{n}P_r\) और \(^{n}C_r\) कब बराबर होते हैं?
When are \(^{n}P_r\) and \(^{n}C_r\) equal?
Explanation opens after your attempt
Correct Answer
A. जब (r=0) या (r=1) होWhen (r=0) or (r=1)
Concept
Because (r!) is (1) only for (r=0) and (r=1). In exams check \(^{n}P_r=^{n}C_r r!\) for equality.
Why this answer is correct
The correct answer is A. जब (r=0) या (r=1) हो / When (r=0) or (r=1). Because (r!) is (1) only for (r=0) and (r=1). In exams check \(^{n}P_r=^{n}C_r r!\) for equality.
Exam Tip
क्योंकि (r!) केवल (r=0) और (r=1) पर (1) होता है। परीक्षा में equality के लिए relation \(^{n}P_r=^{n}C_r r!\) देखें।
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