अंकों (0,1,2,3,4,5,6) से बिना पुनरावृत्ति (4) अंकों की कितनी सम संख्याएं बनेंगी?
How many (4)-digit even numbers can be formed from (0,1,2,3,4,5,6) without repetition?
Explanation opens after your attempt
C. (360)
Concept
If the unit digit is (0), there are \(6\cdot5\cdot4\) ways, and if it is (2,4,6), there are \(3\cdot5\cdot5\cdot4\) ways. The total is (120+300=420).
Why this answer is correct
The correct answer is C. (360). If the unit digit is (0), there are \(6\cdot5\cdot4\) ways, and if it is (2,4,6), there are \(3\cdot5\cdot5\cdot4\) ways. The total is (120+300=420).
Exam Tip
इकाई स्थान (0) हो तो \(6\cdot5\cdot4\) और इकाई स्थान (2,4,6) हो तो \(3\cdot5\cdot5\cdot4\) तरीके हैं। कुल (120+300=420) है।
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