अंकों (1,2,3,4,5,6,7,8) से बिना पुनरावृत्ति (5) अंकों की कितनी सम संख्याएं बनेंगी?
How many (5)-digit even numbers can be formed from (1,2,3,4,5,6,7,8) without repetition?
Explanation opens after your attempt
D. (3360)
Concept
There are (4) even choices for the last place and the remaining (4) places are filled in \(^{7}P_4\) ways. The total is \(4\cdot840=3360\).
Why this answer is correct
The correct answer is D. (3360). There are (4) even choices for the last place and the remaining (4) places are filled in \(^{7}P_4\) ways. The total is \(4\cdot840=3360\).
Exam Tip
अंतिम स्थान पर (4) सम विकल्प हैं और बाकी (4) स्थान \(^{7}P_4\) तरीकों से भरेंगे। कुल \(4\cdot840=3360\) है।
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