अंकों (1,2,3,4,5,6,7) से बिना पुनरावृत्ति (4) अंकों की कितनी संख्याएं बनेंगी जो (5) से समाप्त हों?
How many (4)-digit numbers can be formed from (1,2,3,4,5,6,7) without repetition and ending in (5)?
Explanation opens after your attempt
A. (120)
Concept
The last digit is fixed as (5), and the other three places are filled in \(6\cdot5\cdot4\) ways. The total is (120).
Why this answer is correct
The correct answer is A. (120). The last digit is fixed as (5), and the other three places are filled in \(6\cdot5\cdot4\) ways. The total is (120).
Exam Tip
अंतिम अंक निश्चित (5) है और बाकी तीन स्थान \(6\cdot5\cdot4\) तरीकों से भरेंगे। कुल (120) है।
Login to save your score, XP, coins and progress.
