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
Correct Answer

C. \(^{n}C_r\times r!\)

Step 1

Concept

First there are \(^{n}C_r\) selections and then (r!) arrangements for each selection. In exams multiply for choose then arrange.

Step 2

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.

Step 3

Exam Tip

पहले चयन \(^{n}C_r\) और फिर हर चयन की (r!) व्यवस्थाएँ होती हैं। परीक्षा में choose then arrange को multiply करें।

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Mathematics Answer, Explanation and Revision Hints

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?

Correct Answer: C. \(^{n}C_r\times r!\). Explanation: पहले चयन \(^{n}C_r\) और फिर हर चयन की (r!) व्यवस्थाएँ होती हैं। परीक्षा में choose then arrange को multiply करें। / First there are \(^{n}C_r\) selections and then (r!) arrangements for each selection. In exams multiply for choose then arrange.

Which concept should I revise for this Mathematics MCQ?

First there are \(^{n}C_r\) selections and then (r!) arrangements for each selection. In exams multiply for choose then arrange.

What exam hint can help solve this Mathematics question?

पहले चयन \(^{n}C_r\) और फिर हर चयन की (r!) व्यवस्थाएँ होती हैं। परीक्षा में choose then arrange को multiply करें।