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In how many arrangements can (4) objects be chosen and ordered from (9) distinct objects?कितनी व्यवस्थाओं में (9) अलग-अलग वस्तुओं में से (4) को चुना और क्रम में रखा जा सकता है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (3024)(3024)
Both selection and order are involved, so the count is (^{9}P_{4}). When order matters, do not use combination.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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