यदि (5) अलग किताबों में से (2) किताबें चुनकर display order में रखनी हों तो सही expression क्या है?

If (2) books are chosen from (5) distinct books and placed in display order what is the correct expression?

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Correct Answer

B. \(^{5}C_2\times2!\)

Step 1

Concept

First choose the books and then assign display order. In exams multiply by (r!) when order follows selection.

Step 2

Why this answer is correct

The correct answer is B. \(^{5}C_2\times2!\). First choose the books and then assign display order. In exams multiply by (r!) when order follows selection.

Step 3

Exam Tip

पहले किताबें चुनें फिर display order दें। परीक्षा में selection के बाद order हो तो (r!) से गुणा करें।

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Mathematics Answer, Explanation and Revision Hints

यदि (5) अलग किताबों में से (2) किताबें चुनकर display order में रखनी हों तो सही expression क्या है? / If (2) books are chosen from (5) distinct books and placed in display order what is the correct expression?

Correct Answer: B. \(^{5}C_2\times2!\). Explanation: पहले किताबें चुनें फिर display order दें। परीक्षा में selection के बाद order हो तो (r!) से गुणा करें। / First choose the books and then assign display order. In exams multiply by (r!) when order follows selection.

Which concept should I revise for this Mathematics MCQ?

First choose the books and then assign display order. In exams multiply by (r!) when order follows selection.

What exam hint can help solve this Mathematics question?

पहले किताबें चुनें फिर display order दें। परीक्षा में selection के बाद order हो तो (r!) से गुणा करें।