(1,2,3,4,5,6,7) अंकों से बिना पुनरावृत्ति कितनी (5)-अंकीय सम संख्याएं बन सकती हैं?
How many (5)-digit even numbers can be formed from digits (1,2,3,4,5,6,7) without repetition?
Explanation opens after your attempt
Correct Answer
B. (1080)
Concept
The last digit can be (2,4,6) in (3) ways, and the remaining four places in \(^{6}P_{4}\) ways. For even numbers, fix the unit digit first.
Why this answer is correct
The correct answer is B. (1080). The last digit can be (2,4,6) in (3) ways, and the remaining four places in \(^{6}P_{4}\) ways. For even numbers, fix the unit digit first.
Exam Tip
अंतिम अंक (2,4,6) में से (3) तरीकों से होगा और शेष चार स्थान \(^{6}P_{4}\) तरीकों से भरेंगे। सम संख्या में इकाई अंक पहले तय करें।
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