यदि (7) अलग पुस्तकों में से (3) पुस्तकों को शेल्फ पर क्रम में रखना है तो कौन-सी formula connection सही है?

If (3) books out of (7) distinct books are to be placed on a shelf in order then which formula connection is correct?

Explanation opens after your attempt
Correct Answer

B. \(^{7}P_3\)

Step 1

Concept

Both selection and order are needed so \(^{7}P_3=^{7}C_3\cdot3!\). In exams use permutation when order matters.

Step 2

Why this answer is correct

The correct answer is B. \(^{7}P_3\). Both selection and order are needed so \(^{7}P_3=^{7}C_3\cdot3!\). In exams use permutation when order matters.

Step 3

Exam Tip

पहले चयन और फिर क्रम दोनों चाहिए इसलिए \(^{7}P_3=^{7}C_3\cdot3!\)। परीक्षा में order matters हो तो permutation लें।

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Mathematics Answer, Explanation and Revision Hints

यदि (7) अलग पुस्तकों में से (3) पुस्तकों को शेल्फ पर क्रम में रखना है तो कौन-सी formula connection सही है? / If (3) books out of (7) distinct books are to be placed on a shelf in order then which formula connection is correct?

Correct Answer: B. \(^{7}P_3\). Explanation: पहले चयन और फिर क्रम दोनों चाहिए इसलिए \(^{7}P_3=^{7}C_3\cdot3!\)। परीक्षा में order matters हो तो permutation लें। / Both selection and order are needed so \(^{7}P_3=^{7}C_3\cdot3!\). In exams use permutation when order matters.

Which concept should I revise for this Mathematics MCQ?

Both selection and order are needed so \(^{7}P_3=^{7}C_3\cdot3!\). In exams use permutation when order matters.

What exam hint can help solve this Mathematics question?

पहले चयन और फिर क्रम दोनों चाहिए इसलिए \(^{7}P_3=^{7}C_3\cdot3!\)। परीक्षा में order matters हो तो permutation लें।