कौन-सा संबंध \(^{n}P_r\) और \(^{n}C_r\) को सही जोड़ता है?
Which relation correctly connects \(^{n}P_r\) and \(^{n}C_r\)?
Explanation opens after your attempt
Correct Answer
C. \(^{n}P_r=^{n}C_r\times r!\)
Concept
First (r) objects are chosen and then arranged in (r!) ways. In exams keep the idea of choose first and arrange later.
Why this answer is correct
The correct answer is C. \(^{n}P_r=^{n}C_r\times r!\). First (r) objects are chosen and then arranged in (r!) ways. In exams keep the idea of choose first and arrange later.
Exam Tip
पहले (r) वस्तुएँ चुनी जाती हैं और फिर उन्हें (r!) तरीकों से जमाया जाता है। परीक्षा में पहले चयन फिर व्यवस्था का विचार रखें।
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