(7) अलग-अलग फाइलों को (9) अलग-अलग अलमारियों में एक-एक रखकर कितने तरीकों से रखा जा सकता है?
In how many ways can (7) distinct files be placed one each in (9) distinct shelves?
Explanation opens after your attempt
B. (181440)
Concept
The ordered placement of (7) files in (9) distinct places is \(^{9}P_7=181440\). In exams, distinct shelves make assignment a permutation.
Why this answer is correct
The correct answer is B. (181440). The ordered placement of (7) files in (9) distinct places is \(^{9}P_7=181440\). In exams, distinct shelves make assignment a permutation.
Exam Tip
(9) अलग स्थानों में (7) फाइलों की क्रमित व्यवस्था \(^{9}P_7=181440\) है। परीक्षा में shelves अलग हों तो assignment permutation होता है।
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