कितनी व्यवस्थाओं में (9) अलग-अलग वस्तुओं में से (4) को चुना और क्रम में रखा जा सकता है?
In how many arrangements can (4) objects be chosen and ordered from (9) distinct objects?
Explanation opens after your attempt
B. (3024)
Concept
Both selection and order are involved, so the count is \(^{9}P_{4}\). When order matters, do not use combination.
Why this answer is correct
The correct answer is B. (3024). Both selection and order are involved, so the count is \(^{9}P_{4}\). When order matters, do not use combination.
Exam Tip
चयन और क्रम दोनों हैं, इसलिए \(^{9}P_{4}\) होगा। केवल चयन नहीं, क्रम भी हो तो संयोजन नहीं लगाना चाहिए।
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