अंकों (1,2,3,5,6,7,8) से बिना पुनरावृत्ति (4) अंकों की कितनी संख्याएं (6) से शुरू होंगी?
How many (4)-digit numbers can be formed from (1,2,3,5,6,7,8) without repetition and starting with (6)?
Explanation opens after your attempt
A. (120)
Concept
The first digit is fixed as (6), and the remaining (3) places are filled in \(6\cdot5\cdot4\) ways. The answer is (120).
Why this answer is correct
The correct answer is A. (120). The first digit is fixed as (6), and the remaining (3) places are filled in \(6\cdot5\cdot4\) ways. The answer is (120).
Exam Tip
पहला अंक (6) निश्चित है और बाकी (3) स्थान \(6\cdot5\cdot4\) तरीकों से भरेंगे। उत्तर (120) है।
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