अंकों (0,1,2,3,4,5,6,7,8) से बिना पुनरावृत्ति (50000) से बड़ी कितनी (5)-अंकीय सम संख्याएं बनेंगी?
How many (5)-digit even numbers greater than (50000) can be formed from digits (0,1,2,3,4,5,6,7,8) without repetition?
Explanation opens after your attempt
Correct Answer
B. (3780)
Concept
The first digit must be one of (5,6,7,8), and the last digit must be even, so count by cases. In such problems, fix the first and last positions first.
Why this answer is correct
The correct answer is B. (3780). The first digit must be one of (5,6,7,8), and the last digit must be even, so count by cases. In such problems, fix the first and last positions first.
Exam Tip
पहला अंक (5,6,7,8) में से और अंतिम अंक सम होना चाहिए, इसलिए केस बनाकर गिनती करें। ऐसे प्रश्नों में पहला और अंतिम स्थान पहले तय करें।
Login to save your score, XP, coins and progress.