(8) अलग-अलग छात्रों में से (4) को क्रम में पुरस्कार मंच पर बुलाना है। एक विशेष छात्र शामिल हो लेकिन पहले न बुलाया जाए, तो कितने तरीके होंगे?
From (8) distinct students, (4) are to be called to the prize stage in order. If one particular student is included but not called first, how many ways are possible?
Explanation opens after your attempt
B. (1260)
Concept
The particular student has (3) non-first positions, and the other (3) positions are filled from (7) students in \(^{7}P_3\) ways. The total is \(3\cdot210=630\).
Why this answer is correct
The correct answer is B. (1260). The particular student has (3) non-first positions, and the other (3) positions are filled from (7) students in \(^{7}P_3\) ways. The total is \(3\cdot210=630\).
Exam Tip
विशेष छात्र के लिए अंतिम (3) positions हैं और बाकी (3) positions (7) छात्रों से \(^{7}P_3\) तरीकों से भरते हैं। कुल \(3\cdot210=630\) है।
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