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How many (4)-digit numbers greater than (4000) can be formed from (1,2,3,4,5,6,7,8) without repetition?अंकों (1,2,3,4,5,6,7,8) से बिना पुनरावृत्ति कितनी (4)-अंकीय संख्याएं (4000) से बड़ी बनेंगी?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (840)(840)
The thousands digit can be (4,5,6,7,8), and the remaining (3) places are filled in (^{7}P_{3}) ways. In comparison questions, fix the first digit first.हजार का अंक (4,5,6,7,8) में से होगा और बाकी (3) स्थान (^{7}P_{3}) तरीकों से भरेंगे। तुलना वाले प्रश्नों में पहले पहला अंक तय करें।
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