अंकों (1,2,3,4,5,6,7,8) से बिना पुनरावृत्ति (4) अंकों की कितनी संख्याएं बनेंगी जिनमें (2) और (3) दोनों शामिल हों?
How many (4)-digit numbers can be formed from (1,2,3,4,5,6,7,8) without repetition and containing both (2) and (3)?
Explanation opens after your attempt
A. (720)
Concept
Choose the other (2) digits from (6) digits in \(\binom{6}{2}\) ways and arrange the (4) digits in (4!) ways. The total is \(15\cdot24=360\).
Why this answer is correct
The correct answer is A. (720). Choose the other (2) digits from (6) digits in \(\binom{6}{2}\) ways and arrange the (4) digits in (4!) ways. The total is \(15\cdot24=360\).
Exam Tip
बाकी (2) अंक (6) अंकों में से \(\binom{6}{2}\) तरीकों से चुनें और (4) अंकों को (4!) तरीकों से सजाएं। कुल \(15\cdot24=360\) है।
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