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How many (5)-digit numbers can be formed from (1,2,3,4,5,6,7,8,9) without repetition if both digits (1) and (2) are included?(1,2,3,4,5,6,7,8,9) से बिना पुनरावृत्ति कितनी (5)-अंकीय संख्याएं बनेंगी जिनमें अंक (1) और (2) दोनों शामिल हों?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (2520)(2520)
Include (1,2), choose (3) more digits from the remaining (7), then arrange the (5) digits in (5!) ways. For compulsory objects, include them first and choose the rest.(1,2) के साथ शेष (7) अंकों में से (3) चुनकर (5!) तरीकों से व्यवस्थित करें। अनिवार्य वस्तुओं को पहले शामिल मानकर बाकी चुनें।
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