यदि (r) वस्तुओं को पहले चुनकर फिर क्रम दिया जाए तो कुल व्यवस्था किस expression से बनेगी?
If (r) objects are first selected and then ordered which expression gives the total arrangement?
Explanation opens after your attempt
C. \(^{n}C_r\times r!\)
Concept
First there are \(^{n}C_r\) selections and then (r!) arrangements for each selection. In exams multiply for choose then arrange.
Why this answer is correct
The correct answer is C. \(^{n}C_r\times r!\). First there are \(^{n}C_r\) selections and then (r!) arrangements for each selection. In exams multiply for choose then arrange.
Exam Tip
पहले चयन \(^{n}C_r\) और फिर हर चयन की (r!) व्यवस्थाएँ होती हैं। परीक्षा में choose then arrange को multiply करें।
Login to save your score, XP, coins and progress.
