अंकों (1,2,3,4,5) से बिना पुनरावृत्ति कितनी (4)-अंकीय संख्याएँ बनेंगी?
How many (4)-digit numbers can be formed from digits (1,2,3,4,5) without repetition?
Explanation opens after your attempt
D. (120)
Concept
For four places, there are \(5\times4\times3\times2=120\) ways. Without repetition, choices keep decreasing.
Why this answer is correct
The correct answer is D. (120). For four places, there are \(5\times4\times3\times2=120\) ways. Without repetition, choices keep decreasing.
Exam Tip
चार स्थानों के लिए \(5\times4\times3\times2=120\) तरीके हैं। बिना पुनरावृत्ति में विकल्प घटते जाते हैं।
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