यदि पहले (r) वस्तुओं का चयन किया जाए और फिर उन्हें क्रम में लगाया जाए तो \(^{n}P_r\) का कौन-सा सूत्र स्वाभाविक रूप से प्राप्त होता है?
If first (r) objects are selected and then arranged in order then which formula for \(^{n}P_r\) is naturally obtained?
Explanation opens after your attempt
Correct Answer
B. \(^{n}P_r=^{n}C_r\times r!\)
Concept
Each selected group can be arranged in (r!) ways. In exams treat permutation as selection followed by arrangement.
Why this answer is correct
The correct answer is B. \(^{n}P_r=^{n}C_r\times r!\). Each selected group can be arranged in (r!) ways. In exams treat permutation as selection followed by arrangement.
Exam Tip
चयन के हर समूह को (r!) तरीकों से सजाया जा सकता है। परीक्षा में permutation को selection के बाद arrangement समझें।
Login to save your score, XP, coins and progress.