अंकों (0,1,2,3,4,5,6,7) से बिना पुनरावृत्ति (4) अंकों की कितनी संख्याएं बनेंगी?
How many (4)-digit numbers can be formed from (0,1,2,3,4,5,6,7) without repetition?
Explanation opens after your attempt
A. (1470)
Concept
The first digit cannot be (0), so \(7\cdot7\cdot6\cdot5=1470\). In exams, apply the leading-zero condition first.
Why this answer is correct
The correct answer is A. (1470). The first digit cannot be (0), so \(7\cdot7\cdot6\cdot5=1470\). In exams, apply the leading-zero condition first.
Exam Tip
पहला अंक (0) नहीं हो सकता, इसलिए \(7\cdot7\cdot6\cdot5=1470\)। परीक्षा में leading zero की शर्त पहले लगाएं।
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