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How many (5)-digit numbers can be formed from digits (1,2,3,4,5,6,7,8,9) without repetition such that both digits (1) and (2) are included?अंकों (1,2,3,4,5,6,7,8,9) से बिना पुनरावृत्ति के (5) अंकों की कितनी संख्याएँ बनेंगी जिनमें अंक (1) और (2) दोनों हों?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (2520)(2520)
Choose the remaining (3) digits from (7) digits and arrange all (5) digits in (5!) ways. Include compulsory digits first.बाकी (3) अंक (7) अंकों से चुनें और कुल (5) अंकों को (5!) तरीकों से सजाएँ। आवश्यक अंकों को पहले शामिल करें।
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