यदि \(^{n}P_r=^{n}P_{n-r}\) हर (r) के लिए नहीं होता, तो इसका मुख्य कारण क्या है?
If \(^{n}P_r=^{n}P_{n-r}\) is not true for every (r), what is the main reason?
Explanation opens after your attempt
A. Permutation में complement symmetry सामान्यतः नहीं होतीComplement symmetry generally does not hold in permutations
Simple Explanation
Complement symmetry combination की property है, permutation की नहीं। परीक्षा में \(^{n}C_r\) और \(^{n}P_r\) की identities अलग रखें। / Complement symmetry is a property of combinations, not permutations. In exams keep identities of \(^{n}C_r\) and \(^{n}P_r\) separate.
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