\(^{n}C_r\) में (r) और (n-r) interchangeable क्यों हैं लेकिन \(^{n}P_r\) में नहीं?
Why are (r) and (n-r) interchangeable in \(^{n}C_r\) but not in \(^{n}P_r\)?
Explanation opens after your attempt
A. Combination में chosen और not chosen sets complement होते हैं, permutation में ordered length बदल जाती हैIn combinations chosen and not chosen sets are complements, while in permutations ordered length changes
Simple Explanation
Combination सिर्फ selection गिनता है इसलिए complement works करता है। परीक्षा में ordered slots दिखें तो complement symmetry न लगाएं। / Combination counts only selection so complement works. In exams do not use complement symmetry when ordered slots appear.
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