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How many (5)-digit numbers greater than (30000) can be formed from (0,1,2,3,4,5,6,7) without repetition?अंकों (0,1,2,3,4,5,6,7) से बिना पुनरावृत्ति (5) अंकों की कितनी संख्याएं (30000) से बड़ी होंगी?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (4320)(4320)
The first digit can be (3,4,5,6,7), and the remaining (4) places are filled in (^{7}P_4) ways. The total is (5\cdot840=4200).पहला अंक (3,4,5,6,7) हो सकता है और बाकी (4) स्थान (^{7}P_4) तरीकों से भरेंगे। कुल (5\cdot840=4200) है।
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