अंकों (0,1,2,3,4,5,6,7) से बिना पुनरावृत्ति कितनी (5)-अंकीय संख्याएं बनेंगी जिनमें (0) शामिल हो और संख्या (5) से विभाज्य हो?
How many (5)-digit numbers can be formed from digits (0,1,2,3,4,5,6,7) without repetition if (0) is included and the number is divisible by (5)?
Explanation opens after your attempt
B. (1200)
Concept
The last digit is (0) or (5), and if (5) is last, (0) must be included inside. Count divisibility and compulsory digit cases separately.
Why this answer is correct
The correct answer is B. (1200). The last digit is (0) or (5), and if (5) is last, (0) must be included inside. Count divisibility and compulsory digit cases separately.
Exam Tip
अंतिम अंक (0) या (5) होगा, और (5) अंत में होने पर (0) को भीतर शामिल करना होगा। विभाज्यता और अनिवार्य अंक को अलग केस में गिनें।
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