अंकों (0,1,2,3,4,5,6,7,8,9) से बिना पुनरावृत्ति कितनी (7)-अंकीय संख्याएं बनेंगी जिनमें ठीक (3) सम अंक हों?
How many (7)-digit numbers can be formed from digits (0,1,2,3,4,5,6,7,8,9) without repetition if exactly (3) digits are even?
Explanation opens after your attempt
Correct Answer
B. (230400)
Concept
Choose the even and odd digit groups and count (7!) arrangements, then subtract leading-zero cases. When (0) is included, handle the first digit carefully.
Why this answer is correct
The correct answer is B. (230400). Choose the even and odd digit groups and count (7!) arrangements, then subtract leading-zero cases. When (0) is included, handle the first digit carefully.
Exam Tip
सम और विषम अंकों के समूह चुनकर (7!) व्यवस्थाएं गिनें, फिर अग्र शून्य वाले केस घटाएं। शून्य शामिल हो तो पहला स्थान सावधानी से देखें।
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