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How many (4)-digit numbers can be formed from digits (1,2,3,4,5,6,7,8) without repetition and lying between (3000) and (7000)?अंकों (1,2,3,4,5,6,7,8) से बिना पुनरावृत्ति के कितनी (4) अंकों की संख्याएँ बनेंगी जो (3000) और (7000) के बीच हों?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (840)(840)
The thousands digit is (3,4,5,6), and the remaining (3) places can be filled in (7P3) ways. For range questions, fix the first digit first.हजारों का अंक (3,4,5,6) होगा और बाकी (3) स्थान (7P3) तरीकों से भरेंगे। सीमा वाली संख्या में पहला अंक तय करने से काम आसान होता है।
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