अंकों (1,2,3,4,5,6,7,8,9) से बिना पुनरावृत्ति (5) अंकों की कितनी संख्याएं (3) से शुरू और सम होंगी?
How many (5)-digit numbers can be formed from (1,2,3,4,5,6,7,8,9) without repetition, starting with (3) and even?
Explanation opens after your attempt
C. (360)
Concept
The first digit is fixed as (3), and the last place has (4) even choices. The middle (3) places are filled in \(7\cdot6\cdot5\) ways, giving (840).
Why this answer is correct
The correct answer is C. (360). The first digit is fixed as (3), and the last place has (4) even choices. The middle (3) places are filled in \(7\cdot6\cdot5\) ways, giving (840).
Exam Tip
पहला अंक (3) निश्चित है और अंतिम स्थान के लिए (4) सम विकल्प हैं। बीच के (3) स्थान \(7\cdot6\cdot5\) तरीकों से भरेंगे, कुल (840) है।
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