अंकों (0,1,2,3,4,5,6,7,8,9) से (6) अंकों की कितनी संख्याएँ बनेंगी जिनमें अंक दोहराए न जाएँ, संख्या (25) से विभाज्य हो और अंक (7) अवश्य आए?
Using digits (0,1,2,3,4,5,6,7,8,9), how many (6)-digit numbers can be formed without repetition, divisible by (25), and containing the digit (7)?
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Correct Answer
C. (3060)
Concept
The valid last-two-digit endings are (25,50,75), and the presence of (7) is checked in each case. For divisibility by (25), fix the last two digits first.
Why this answer is correct
The correct answer is C. (3060). The valid last-two-digit endings are (25,50,75), and the presence of (7) is checked in each case. For divisibility by (25), fix the last two digits first.
Exam Tip
अंतिम दो अंकों के वैध रूप (25,50,75) हैं और प्रत्येक मामले में (7) की उपस्थिति देखें। (25) से विभाज्यता में अंतिम दो अंक पहले तय करें।
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