(9) अलग-अलग फाइलों में से (4) फाइलों को क्रम से रखने के तरीके कितने हैं?
How many ways are there to arrange (4) files from (9) different files in order?
Explanation opens after your attempt
B. (3024)
Concept
\({}^{9}P_{4}=9\times8\times7\times6=3024\). Use \({}^{n}P_{r}\) for ordered selection.
Why this answer is correct
The correct answer is B. (3024). \({}^{9}P_{4}=9\times8\times7\times6=3024\). Use \({}^{n}P_{r}\) for ordered selection.
Exam Tip
\({}^{9}P_{4}=9\times8\times7\times6=3024\) है। क्रम वाले चयन में \({}^{n}P_{r}\) लगाएं।
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