अंकों (1,4,7,8,9) से बिना पुनरावृत्ति कितनी (3)-अंकीय संख्याएँ बनेंगी?
How many (3)-digit numbers can be formed from digits (1,4,7,8,9) without repetition?
Explanation opens after your attempt
D. (60)
Concept
For three places, there are \(5\times4\times3=60\) ways. Without repetition, each next choice decreases.
Why this answer is correct
The correct answer is D. (60). For three places, there are \(5\times4\times3=60\) ways. Without repetition, each next choice decreases.
Exam Tip
तीन स्थानों के लिए \(5\times4\times3=60\) तरीके हैं। बिना पुनरावृत्ति में हर अगला विकल्प कम होता है।
Login to save your score, XP, coins and progress.
