अंकों (1,2,3,4,5,6,7) से बिना पुनरावृत्ति (5) अंकों की कितनी संख्याएं बनेंगी जो (5) पर समाप्त हों?
How many (5)-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. (360)
Concept
The last digit is fixed as (5), and the remaining (4) places are filled in \(^{6}P_4\) ways. So the answer is (360).
Why this answer is correct
The correct answer is A. (360). The last digit is fixed as (5), and the remaining (4) places are filled in \(^{6}P_4\) ways. So the answer is (360).
Exam Tip
अंतिम अंक (5) निश्चित है और बाकी (4) स्थान \(^{6}P_4\) तरीकों से भरेंगे। इसलिए उत्तर (360) है।
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