अंकों (2,3,4,5,6,7) से बिना पुनरावृत्ति (4) अंकों की कितनी सम संख्याएं बनेंगी?
How many (4)-digit even numbers can be formed from (2,3,4,5,6,7) without repetition?
Explanation opens after your attempt
A. (180)
Concept
There are (3) even choices for the units place and \(5\cdot4\cdot3\) ways for the rest, so (180). In exams, apply the last-digit condition first.
Why this answer is correct
The correct answer is A. (180). There are (3) even choices for the units place and \(5\cdot4\cdot3\) ways for the rest, so (180). In exams, apply the last-digit condition first.
Exam Tip
इकाई स्थान पर (3) सम विकल्प हैं और बाकी \(5\cdot4\cdot3\) तरीके हैं, इसलिए (180)। परीक्षा में अंतिम अंक की शर्त पहले लगाएं।
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