यदि (3) पुस्तकों को (8) पुस्तकों में से चुनकर क्रम में रखना हो तो कौन-सा expression सही है?
If (3) books are chosen from (8) books and placed in order which expression is correct?
Explanation opens after your attempt
B. \(^{8}C_3\times3!\)
Concept
First choose (3) books and then order them in (3!) ways. In exams add arrangement after selection when ordered placement appears.
Why this answer is correct
The correct answer is B. \(^{8}C_3\times3!\). First choose (3) books and then order them in (3!) ways. In exams add arrangement after selection when ordered placement appears.
Exam Tip
पहले (3) पुस्तकें चुनें और फिर (3!) तरीकों से क्रम दें। परीक्षा में ordered placement हो तो चयन के बाद व्यवस्था जोड़ें।
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