अंकों (0,1,2,3,4,5,6,7,8) से बिना पुनरावृत्ति (4) अंकों की कितनी संख्याएं (4000) से कम होंगी?
How many (4)-digit numbers less than (4000) can be formed from (0,1,2,3,4,5,6,7,8) without repetition?
Explanation opens after your attempt
A. (1344)
Concept
The thousands place has (3) choices (1,2,3), and the remaining (3) places have \(8\cdot7\cdot6\) ways. The total is (1008).
Why this answer is correct
The correct answer is A. (1344). The thousands place has (3) choices (1,2,3), and the remaining (3) places have \(8\cdot7\cdot6\) ways. The total is (1008).
Exam Tip
हजार स्थान पर (1,2,3) के (3) विकल्प हैं और बाकी (3) स्थान \(8\cdot7\cdot6\) तरीकों से भरेंगे। कुल (1008) है।
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