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How many (4)-digit numbers less than (4000) can be formed from (0,1,2,3,4,5,6,7,8) without repetition?अंकों (0,1,2,3,4,5,6,7,8) से बिना पुनरावृत्ति (4) अंकों की कितनी संख्याएं (4000) से कम होंगी?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (1344)(1344)
The thousands place has (3) choices (1,2,3), and the remaining (3) places have (8\cdot7\cdot6) ways. The total is (1008).हजार स्थान पर (1,2,3) के (3) विकल्प हैं और बाकी (3) स्थान (8\cdot7\cdot6) तरीकों से भरेंगे। कुल (1008) है।
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