किस expression से \(^{n}P_r\) को पहले चयन और फिर व्यवस्था के रूप में दिखाया जा सकता है?
Which expression shows \(^{n}P_r\) as selection first and arrangement later?
Explanation opens after your attempt
Correct Answer
C. \(^{n}C_r\times r!\)
Concept
There are \(^{n}C_r\) ways to choose (r) objects and then (r!) arrangements. In exams write ordered selection as choose and arrange.
Why this answer is correct
The correct answer is C. \(^{n}C_r\times r!\). There are \(^{n}C_r\) ways to choose (r) objects and then (r!) arrangements. In exams write ordered selection as choose and arrange.
Exam Tip
पहले (r) वस्तुएँ चुनने के \(^{n}C_r\) तरीके हैं और फिर (r!) व्यवस्थाएँ हैं। परीक्षा में ordered selection को choose and arrange लिखें।
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